Question

A moving mass of 8 kg collides elastically with a stationary mass of 2 kg. If E be the initial kinetic
energy of the mass, the kinetic energy left with it after collision will be

Answer 1

Answer:

0.36 KE

Explanation:

Conservation of linear momentum

8v=2v1+8v2

and

defintion of coefficient of Restitution

v−0v2−v1 = −1 ⇒ v2−v1 = -v.

solving these equations we get

v2=0.6v

final KE =21 m(0.6v)2 = 0.36KE