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Q.

A bullet fired into a fixed target loses half of its velocity in penetrating 15 cm. How much further it will penetrate before coming to rest?

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a

5 cm

b

15 cm

c

7.5 cm

d

10 cm

answer is A.

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Detailed Solution

a=v2-u22s= -3u28s 0-u24= 2(-3u28s)s' s'= 5cm
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