A sphere of mass `m_(1)` in motion hits directly another sphere of mass `m_(2)` at rest and sticks to it, the total kinetic energy after collision is `2//3` of their total K.E. before collision. Find the ratio of `m_(1) : m_(2)`.

A sphere of mass '2m' gm collides with a stationary sphere of '3m' gm and sticks to it.Then the loss in kinetic energy during collision is

A spherical ball of mass m_(1) collides head on with another ball of mass m_(2) at rest . The collision is elastic . The fraction of kinetic energy lost by m_(1) is :

A spherical ball of mass m_(1) colliddes head on with another ball of mass m_(2) at rest . The collision is elastic . The fraction of kintic energy lost by m_(1) is :

A mass m collides with another mass 2m and sticks to it. What is the nature of the collision?

A body of mass m_(1) moving at a constant speed undergoes an elastic head on collision with a body of mass m_(2) initially at rest. The ratio of the kinetic energy of mass m_(1) after the collision to that before the collision is -