A car start from rest and acquire a velocity of 54km/h in 2sec. Find the acceleration of the car.
A
5m/s2
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B
7.5m/s2
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C
15m/s2
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D
7m/s2
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Solution
The correct option is B7.5m/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=54km/h=54×10003600=15m/s
Hence, a=15−02=7.5m/s2