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## Homework Statement

A ball of mass 2m is moving with a velocity V

_{o}collides elastically and head-on with another ball of mass m at rest.

Find the minimum kinetic energy of the system.

## Homework Equations

K = 1/2 mv

^{2}

## The Attempt at a Solution

I personally do not understand what is expected of me here. The answer expected is

(2mV

_{o}

^{2})/3.

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 (mV

_{o}

^{2}) throughout?