A bullet initially moving with velocity 10m/s strikes a target and comes to rest after penetrating a distance of 20 cm in the target .Calculate the retardation of the bullet.
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Correct option is 2000ms
−2
u=20ms
−1
v=0
s=10cm=0.1m
Let reatardation=a
v
2
=u
2
−2as
or 0=(20)
2
−(2×a×0.1)
or a=
2
400
ms
−2
=2000ms
−2
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