A body of mass 1 kg strikes elastically with another body at rest and continues to move in the same direction with one fourth of its initial velocity. The mass of other body is :

Options

A. 3 kg
B. 0.6 kg
C. 2.4 kg
D. 4 kg

Answer

b

Explanation

`v_(1)=((m_(1)-m_(2))v_(1)+2m_(2)v_(2))/(m_(1)+m_(2))`
`v/4=((1-m_(2))u+0)/(1+m_(2))`
`implies1+m_(2)=4-4m_(2)implies5m_(2)=3`
`impliesm_(2)=3/5=0.6 kg`