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Q.

A body of mass 1kg collides elastically with another body at rest and then continues to move in the original direction with one half of its original speed. The mass of the target body is

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a

23kg

b

1 kg

c

13kg

d

12kg

answer is C.

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Detailed Solution

Given that

m1=1kg,u1=u,u2=0,v1=u2

We can have

vl=m1−m2m1+m2u1+2m1m1+m2u2

u2=1−m21+m2u+0

12=1−m21+m2

1+m2=2−2m2m2+2m2=2−1

3m2=1m2=13Kg

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