A bullet initially moving with a velocity of 20ms−1 strikes a target and comes to rest after penetrating a distance of 10cm in the target. Calculate the retardation caused by the target.
None of these
1500ms−2
2000ms−2
1000ms−2
A
2000ms−2
B
None of these
C
1500ms−2
D
1000ms−2
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Solution
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The correct option is C2000ms−2 u=20ms−1 v=0 s=10cm=0.1m Let reatardation=a v2=u2−2as or 0=(20)2−(2×a×0.1) or a=4002ms−2=2000ms−2
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