A car covers the first half of the distance

Asked by admin @ 17/08/2021 in Physics viewed by 286 People

1] a car covers the first half of the distance between two places at a speed of 40 km/h and the second half at 60 km/h .what is the average speed of the car

2]a car goes from town A to another town B with a speed of 40 km/h and returns back to the town A with a speed of 60 km/h.calculate the average speed during the whole journey.3] a girl moves with a speed of 6 km/h for 2hrs and with the speed of 4km/h for the next 3hrs. Find the average speed of the girl and the total distance moved.

Answered by admin @ 17/08/2021

(1) let x/2 distance cover in time t1 & another x/2 distance cover in time t2
t1 = (x/2)/40
t2 = (x/2)/60
t1+t2 = x/48
average speed = x/(t1+t2)
= x/(x/48)
= 48Km/hr
(2) as the above
t1 = x/40
t2 = x/60
t1+t2 = x/24
average speed = 2x/(x/24)
=48Km/hr
(3) s1 = 6*2
= 12Km.
s2 = 4*3
= 12Km.
total distance = s1+s2 = 24km.
average speed = 24/5
= 4.8Km/hr

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