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Q.

A bullet of mass 200 g having initial kinetic energy 90 J is shot inside a long swimming pool as shown in the figure. If it's kinetic energy reduces to 40 J within 1s, the minimum length of the pool, the bullet has a travel so that it completely comes to rest is 

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a

25 m

b

45 m

c

125 m

d

90 m

answer is A.

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Detailed Solution

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u = 10.22×0.2×90 = 30 m/s

v = 10.22×0.2×40 = 20 m/s

a=20-301 = -10m/s2

s = -u22a = 45 m

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