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Question

The displacement of a body in 8 s starting from rest with an acceleration of 20 cm/s2 is

A
64 m
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B
64 cm
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C
640 cm
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D
0.064 m
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Solution

The correct option is C 640 cm
Given acceleration = 20 cm/s2=0.20 m/s2

Using second equation of motion, we know
S=ut+12at2
At t=0, body is at rest
u=0
S=12at2=12×(0.2)(64)
=6.4 m=640 cm

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