# A 0.250-kgkg&nbsp;ice puck, moving east

A 0.250-kg$\mathrm{k}\mathrm{g}$ ice puck, moving east with a speed of 5.80 m/s$\mathrm{m}/\mathrm{s}$, has a head-on collision with a 0.900-kg$\mathrm{k}\mathrm{g}$ puck initially at rest. Assume that the collision is perfectly elastic.

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