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a cue ball is shot at 7m/s east on a pool table toward a stationary billiard...

a cue ball is shot at 7m/s east on a pool table toward a stationary billiard ball with equal mass. after the collision the billiard ball goes off at an angle 20 degrees north of east. ignore friction and rotation and assume the collision is elastic. find the speed of each ball and the direction of the cue ball. (please include free body diagram and explanations).

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