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Q.

A car initially at rest starts moving with an acceleration of4ms−2.The time in which it picks up a velocity of 72ms−1 is                                              

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a

16s

b

18s

c

20s

d

15s

answer is B.

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Detailed Solution

u=0m/s   a=4m/s2    V=72m/s

a=V−ut→t=V−ua

t=72−04=721841s

t= 18s

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A car initially at rest starts moving with an acceleration of4ms−2.The time in which it picks up a velocity of 72ms−1 is