Posted by **Danielle** on Wednesday, July 11, 2012 at 6:35pm.

A ball of mass 0.440 kg moving east (+x direction) with a speed of 3.80 m/s collides head-on with a 0.600 kg ball at rest. If the collision is perfectly elastic, what will be the speed and direction of each ball after the collision?

- physics -
**MathMate**, Wednesday, July 11, 2012 at 7:06pm
Let

u=vel. before, and

v=vel. after collision

velocities are positive in +x direction.

Momentum is conserved for elastic and non-elastic collisions:

∑mu = ∑mv

If the collision is perfectly elastic, then kinetic energies are conserved before and after collision :

∑ (1/2)mu² = ∑(1/2)mv².

Since all velocities before collision are known, there are two equations to solve for two unknowns, v1 and v2.

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