Derive an expression for kinetic energy of a body

Asked by admin @ 20/08/2021 in Physics viewed by 275 People

Derive an expression for kinetic energy possessed by an object of mass m moving with velocity v. also state si unit of kinetic energy.

Answered by admin @ 20/08/2021

Consider a body of mass "m" moving with an initial velocity "u".
A constant force "F" acts on it and the velocity changes to "v".

Let "s" be the distance covered and "a" be the constant acceleration

We know that

v² - u² = 2as

s = $\frac{v^{2} - u ^{2} }{2a}$

We know that ,

Work done = Force(F) × displacement (s)

F = ma

W = ma × $\frac{v^{2} - u ^{2} }{2a}$

["a" gets cancelled ]

W = m × $\frac{v^{2} - u ^{2} }{2}$
= $\frac{1 }{2}$ m[v² - u² ]

When , initial velocity , u = 0

W = $\frac{1 }{2}$ mv²

K.E = Work done
= $\frac{1 }{2}$ mv²

A hair dryer with a resistance of 9.6 ohms operates at 120 volts for 2.5 minutes. the total electrical energy used by the dryer during this time interval is

Asked by maham237 @ 13/01/2021 in Physics viewed by 1200 persons

Mind map for light reflection and refraction class 10

Asked by admin @ 23/08/2021 in Physics viewed by 1143 persons

A thief runs at a speed of 10m s

Asked by admin @ 23/08/2021 in Physics viewed by 1095 persons

The african cicada is the world's loudest insect, producing a sound intensity level of 107 db at a distance of 0.50 m. what is the intensity of its sound (in w/m2) as heard by someone standing 3.1 m away? express your answer in watts per meter squared.

Asked by maham237 @ 10/01/2021 in Physics viewed by 1095 persons

A 5.8 x 10 4 watt elevator motor can lift

Asked by maham237 @ 20/06/2021 in Physics viewed by 1080 persons

Derive an expression for kinetic energy of a body

Similar Questions

Derive an expression for potential energy of a body

Define kinetic energy and derive an expression for it

Derive an expression for kinetic energy of an object

Derive an expression for potential energy of a spring

Derivation of kinetic energy and potential energy class 9

Kinetic energy of a body is increased by 300

The kinetic energy of a body decreases by 19

The kinetic energy of a rotating body depends upon

Which of the following bodies has the largest kinetic energy

Derive a formula for the fraction of kinetic energy lost

When do roller coaster cars reach their maximum kinetic energy

The kinetic energy of water is at its lowest when

Energy trapped by the body from food is used to

What is the kinetic energy of an object at rest

Calculate the total kinetic energy in btu of an object

Most viewed questions in Physics

Jeevandeep health and physical education std 10 answers pdf

Hc verma physics class 9 solutions of describing motion

How to leave nightmare land answer key

Base area and stability of some objects with different shapes

Which of the following statements about safe lifting are correct

Porous water-absorbing mass of fibers

Absorption of water by filter paper is due to

A composite wire of uniform diameter 3mm

At a distance l 400m from the traffic light

A rocket of mass m is launched straight up with thrust f⃗ thrust.

A hair dryer with a resistance of 9.6 ohms operates at 120 volts for 2.5 minutes. the total electrical energy used by the dryer during this time interval is

Mind map for light reflection and refraction class 10

A thief runs at a speed of 10m s

The african cicada is the world's loudest insect, producing a sound intensity level of 107 db at a distance of 0.50 m. what is the intensity of its sound (in w/m2) as heard by someone standing 3.1 m away? express your answer in watts per meter squared.

A 5.8 x 10 4 watt elevator motor can lift