A proton of mass m collides elastically with a particle of unknown mass at rest After the collision the proton and the unknwon particle are seen moving at an angle fo `90^(@)` with respect to each other The mass of unknown particle is :

A particle of mass m moving with velocity u collides elastically with a particle of mass 3m at rest. After collision the heavier particle moves with velocity.

A particle of mass m moving with velocity u collides elastically head on with a particle of mass 2m at rest. After collision the heavier particle moves with velocity?

Consider elastic collision of a particle of mass m moving with a velocity u with another particle of the same mass at rest. After the collision the projectile and the struck particle move in direction making angles theta_(1) and theta_(2) respectively with the initial direction of motion. The sum of the angles. theta_(1)+theta_(2) , is

A particle of mass m collides with a stationary particle and continues to move at an angle of 45^(@) with respect to the original direction. The second particle also recoils at an angle of 45^(@) to this direction. The mass of the second particle is (collision is elastic)

A particle of mass m collides with a stationary particle and continues to move at an angle of 45^(@) with respect to the original direction . The second particle also recoils at an angle of 45^(@) to this direction . The mass of the second particle is (collision is elastic )