A billiard ball moving at 500 ms strikes a stationary ball, Ask an Expert

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A billiard ball moving at 5.00 m/s strikes a stationary ball of the same mass. After the collision, the first ball moves at 4.29 m/s, at an angle of +31.0° with respect to the original line of motion. Assuming an elastic collision (and ignoring friction and rotational motion), find the struck ball's velocity after the collision.

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