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Question

A bullet initially moving with a velocity of 20ms1 strikes a target and comes to rest after penetrating a distance of 10cm in the target. Calculate the retardation caused by the target.
  1. None of these
  2. 1500ms2
  3. 2000ms2
  4. 1000ms2

A
2000ms2
B
None of these
C
1500ms2
D
1000ms2
Solution
Verified by Toppr

The correct option is C 2000ms2
u=20ms1
v=0
s=10cm=0.1m
Let reatardation=a
v2=u22as
or 0=(20)2(2×a×0.1)
or a=4002ms2=2000ms2

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