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Question

A car start from rest and acquire a velocity of 54 km/h in 2 sec. Find the acceleration of the car.

A
5 m/s2
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B
7.5 m/s2
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C
15 m/s2
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D
7 m/s2
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Solution

The correct option is B 7.5 m/s2
As car starts from rest, si its initial velocity, say, vi=0
Acceleration of the car is given by
a=ΔvΔt
Final velocity of car, vf=54 km/h=54×10003600=15 m/s
Hence, a=1502=7.5 m/s2

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