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Q.

A body of mass 6 kg makes an elastic collision with another body which is at rest. The first  body then moves in the same direction with its speed reduced by one half. Then mass of the second body is

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a

4 kg

b

3 kg

c

1 kg

d

2 kg

answer is B.

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Detailed Solution

u12=m1−m2m1+m2u1

12=6−x6+x

6+x=12−2x

3x=6

x=2 kg

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