Question

A bullet in tilly moving with a velocity 20 m per second strikes a target and comes to rest after penetrating a distance 10 cm in the target. Calculate the retardation caused by the target.

Answer 1

u = 20 m/s
v = 0
s = 0.01 m  [Changed 10 cm to meter for sake of simplicity ]
v²-u²=2as
0²-20²=2×a×0.01
-400=0.02a
a= -400/0.02
a = -20000 m/s²

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