A body of mass 2 kg makes an elastic collision with another body at rest and continues to move in the original direction but with one - fourth its original speed . What is the mass of the body it collides with ?

Options

A. 0.75 kg
B. 1.0 Kg
C. 1,2 Kg
D. None of these

Answer

D

Explanation

For the object of mass 2.0 kg.
`(Deltak)/(k)=(4m_(1)m_(2))/((m_(1)+m_(2))^(2))`
Here,`m_(1)`=2.0 kg,`m_(2)=M`
`therefore (3)/(4)=(4xx2M)/((2+M)^(2))impliesM=(2)/(3)kg` or 6kg