Q.

A body of mass 2 kg makes an elastic collision with another body at rest and continues to move in the original direction with one fourth of its original speed. The mass of the second body which collides with the first body is

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a

2 kg

b

1.2 kg

c

3 kg

d

1.5 kg

answer is B.

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Detailed Solution

m1=2 kg and v1=m1−m2m1+m2 u1=u14 (given)By solving we get  m2=1.2 kg
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A body of mass 2 kg makes an elastic collision with another body at rest and continues to move in the original direction with one fourth of its original speed. The mass of the second body which collides with the first body is