A billiard ball of mass .155 kg moves with a velocity of 12.5 m/s toward a stationary billiard ball of identical mass and strikes it in a head on collision. The first billiard ball comes to a complete stop. Was the collision elastic?
1 Answer
Mar 18, 2018
Suppose,a ball of mass
Let,after the collision velocity of the 2nd mass will be
So,applying law of conservation of momentum,
so,
so,kinetic energy before the collision =
and after the collision,kinetic energy became =
So,kinetic energy before and after the collision remains the same.
Hence it was an elastic collsion.
Remember,in an elastic collsion,two identical mass just exchange their velocity.
And,coefficient of restitution is