A ball thrown up vertically returns to the thrower

Asked by admin @ in Science viewed by 288 People

Question 18 A ball thrown up vertically returns to the thrower after 6 s. Find (a) the velocity with which it was thrown up, (b) the maximum height it reaches, and (c) its position after 4 s.

Class 9 - Science - Gravitation Page 144

Answered by admin @


Time to reach Maximum height ,
t = 6/2 = 3 s.

v = 0 (at the maximum height )

a = - 9.8 m s-²

◆ a) Using, v = u + at, we get

0 = u - 9.8 × 3

or, u = 29.4 ms-¹

Thus, the velocity with which it was thrown up = 29.4ms-¹


◆ b) Using, 2aS = v² - u², we get

S = v²- u²/2a

= 0 - 29.4 × 29.4/- 2× 9.8

= 44.1 m

Thus, Maximum height it reaches = 44.1 m.


◆ c) Here, t = 4s. In 3 s, the ball reaches the maximum height and in 1 s it falls from the top.

Distance covered in 1 s from maximum height,

S = ut + 1/2at ²

= 0 + 1/2 × 9.8 × 1

= 4.9 m

Therefore, The ball will be 4.9 m below the top of the tower after 4 s.

Similar Questions

A ball is thrown vertically upward from the ground

Asked by admin @ in Physics viewed by 309 persons

A ball is thrown vertically upward from the ground. It crosses a point at the height of 25 m twice at an interval of 4 seconds. The ball was thrown …

Ball is thrown vertically upward with a speed of 19.6

Asked by admin @ in Physics viewed by 351 persons

. A ball thrown vertically upwards with a speed of 19.6 ms-1 from the top of a tower returns to the earth in 6 seconds. Find the height of the …

A ball is thrown vertically upward with speed u

Asked by admin @ in Physics viewed by 301 persons

If a ball is thrown vertically upwards with a speed u the distance covered during last t seconds of its ascent

A ball is thrown vertically upward with velocity u

Asked by admin @ in Physics viewed by 302 persons

a ball is thrown vertically upward with a velocity u from the top of a tower. If it strikes the ground with velocity 3u the time taken by the ball …

Two balls of different masses are thrown vertically upward

Asked by admin @ in Physics viewed by 342 persons

Two balls of different masses are thrown vertically upwards with same initial speed. Which one of them will rise to the greater height ? 

A particle of mass 100g is thrown vertically

Asked by admin @ in Math viewed by 333 persons

a particle of mass 100g is thrown vertically upwards with a speed of 5m/s.the work done by the force of gravity during the time particle goes up is?

A body is thrown vertically up from the ground

Asked by admin @ in Physics viewed by 280 persons

A body is thrown vertically up from the ground.it reaches a maximum height of 125 m in 5 sec.After what time it will reach the ground from maximum height position

A particle of mass 100 g is thrown vertically

Asked by admin @ in Math viewed by 321 persons

a particle of mass 100g is thrown vertically upwards with a speed of 5m/s.the work done by the force of gravity during the time particle goes up is?

A pebble of mass 0.05 kg is thrown vertically

Asked by admin @ in Physics viewed by 324 persons

 A pebble of mass 0.05 kg is thrown vertically upwards. Give the direction and magnitude of the net force on the pebble, (a) during its upward motion,(b) during its …

A ball thrown up is caught after 4.00 s

Asked by admin @ in Physics viewed by 277 persons

a ball thrown up is caught by thrower after 4 seconds.how high did it go and with what velocity was it thrown?how far below it highest point was in 3 …

A body of mass 2kg is thrown vertically upwards

Asked by admin @ in Physics viewed by 317 persons

A body of mass 2 kg is thrown vertically upwards with an initial velocity of 20m/s. What will be its potential energy at the end of 2s ? ( Assume …

A man throws balls with the same speed vertically

Asked by admin @ in Physics viewed by 288 persons

a man throws ball with the same speed vertically upward one after the other at an interval of 2 seconds.what should be the speed of the throws so that more …

Velocity time graph of a body thrown vertically upwards

Asked by admin @ in Physics viewed by 314 persons

Draw velocity time graph where the object is thrown vertically upwards

Overcoming fixed mindset: a step-by-step guide to cultivating a growth mindset

Asked by wiki @ in Health viewed by 1284 persons

Which of the following would best complete this list?

Asked by wiki @ in Social Studies viewed by 743 persons

Most viewed questions in Science

Vikas science and technology experiment book std 10 answers

Asked by admin @ in Science viewed by 6200 persons

Rpa focuses on ease of use by reducing human dependency

Asked by admin @ in Science viewed by 4815 persons

Which scenario best illustrates the implementation of data governance

Asked by admin @ in Science viewed by 3901 persons

Collect metal vessels and various metal articles write detailed information

Asked by admin @ in Science viewed by 3831 persons

Britannica learning the english channel class 5 solutions pdf

Asked by admin @ in Science viewed by 3270 persons

Abdul while driving to school computes the average speed

Asked by admin @ in Science viewed by 2269 persons

Vet in the forest class 7 questions and answers

Asked by admin @ in Science viewed by 2043 persons

Rpa is capable of learning and responding to new situations

Asked by admin @ in Science viewed by 1757 persons

Born to express not to impress meaning in tamil

Asked by admin @ in Science viewed by 1607 persons

Why do we fall ill class 9 mind map

Asked by admin @ in Science viewed by 1447 persons

Vikas science and technology experiment book std 10 pdf

Asked by admin @ in Science viewed by 1333 persons

Which of the following statements regarding electrical safety is correct

Asked by admin @ in Science viewed by 1303 persons

Oxford new science in everyday life class 5 solutions

Asked by admin @ in Science viewed by 1258 persons

Born to express not to impress meaning in marathi

Asked by admin @ in Science viewed by 1247 persons

This fish changes colour to merge with its background

Asked by admin @ in Science viewed by 1115 persons