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Q.

A car initially at rest starts with a uniform acceleration and gains a velocity of20 ms−1 in 4 s. The   displacement of the car is             

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a

40 m

b

80 m

c

160 m

d

120 m

answer is A.

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Detailed Solution

Initial velocity u = 0, Final velocity v=20m/s

Time t = 4s, Distance travelled s = ?

a=v−ut=20−04=5ms−2

s=ut+12at2

=0+12×5×(4)2=40m

s=40m

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