# Conservation of momentum and energy

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A 0.420 kg ice puck, moving east with a speed of 3.04 m/s, has a head-on collision with a 0.930 kg puck initially at rest. Assuming a perfectly elastic collision, what is the speed of the lighter puck? Use east as the positive axis.

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#### Solution Preview

A 0.420 kg ice puck, moving east with a speed of 3.04 m/s, has a head-on collision with a 0.930 kg puck initially at rest. Assuming a perfectly elastic collision, what is the speed of the lighter puck? Use east as the positive axis.

For perfectly elastic collision

m1u1= m1v1+m2v2 ----Conservation of momentum

1/2 m1 u1^2 = 1/ m1 ...

#### Solution Summary

The solution calculates the speed of an ice puck after collision.

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