a bullet initially moving with a velocity of 20m/s strikes a target and comes to rest after penetrating a distance of 0.01m in the target . calculate the retardation produced by the target .
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2
kinetic energy = work done
1÷2×m×20×20 = force × displacement
200m = ma×0.01
20000=a
1÷2×m×20×20 = force × displacement
200m = ma×0.01
20000=a
Answered by
5
Answer:
u = 20 m/s
v = 0
s = 0.01 m
v²-u²=2as
0²-20²=2×a×0.01
-400=0.02a
a= -400/0.02
a = -20000 m/s²
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