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Q.

The velocity of a bullet is reduced from 200m/s to 100m/s while travelling through a wooden block of thickness 10cm. The retardation, assuming it to be uniform, will be

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a

10×104 m/s2

b

12×104 m/s2

c

13.5×104 m/s2

d

15×104 m/s2

answer is D.

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Detailed Solution

given initial velocity=u=200 m/s; final velocity= v=100 m/s, s=0.1 m acceleration=a=u2−v22s a=(200)2−(100)22×0.1 a=15×104m/s2
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