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A ball of mass 2.5 kg moving east with a speed of 4.2 m/sec collides head-on...

A ball of mass 2.5 kg moving east with a speed of 4.2 m/sec collides head-on with a 1 kg ball initially moving at 1.7 m/sec to the west. If the collision is elastic, what will be the speed and direction of each ball after the collision?

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