A ball of mass 2m is moving with a velocity Vo collides elastically and head-on with another ball of mass m at rest.
Find the minimum kinetic energy of the system.
K = 1/2 mv2
The Attempt at a Solution
I personally do not understand what is expected of me here. The answer expected is
But collision is elastic. And I have to find the Kinetic energy of the system. Won't the Kinetic energy of the system remain constant (mVo2) throughout?