Question

A proton of mass m collides elastically with

a particle of unknown mass at rest. After

the collision, the proton and the unknown

particle are seen moving at an angle of 90

with respect to each other. The mass of

unknown particle is :

(1)

m

2

(2) m

(3)

m

3

(4) 2 m

Answer 1

Answer:

Step-by-step explanation:

m/2