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Q.

A bus accelerates uniformly from rest and acquires a speed of 72km/h in  20s.  The acceleration of the bus is    

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a

5ms−2

b

1ms−2

c

10ms−2

d

2ms−2

answer is D.

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Detailed Solution

u=oms−1

v=72 kmph=72× 518ms−1

v=20ms−1

t=10s

a=v−ut=20−020=1ms−1

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A bus accelerates uniformly from rest and acquires a speed of 72km/h in  20s.  The acceleration of the bus is