Two particles of equal masses moving with same collide perfectly inelastically. After the collision the combined mass moves with half of the speed of the individual masses. The angle between the initial momenta of individual particle is

Options

A. `60^(@)`
B. `90^(@)`
C. `180^(@)`
D. `120^(@)`

Answer

D

Explanation

Ans. (4)

Apply moment of conservation
`mvsintheta+mvsintheta=2m((v)/(2))`
`2sintheta=1`
`sintheta=(1)/(2)`
`theta=30^(@)`