Physics HELP HELP

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A cue ball traveling at 4.0 m/s makes a glancing, elastic collision with a target ball of equal mass that is initially at rest. The cue ball is deflected so that it makes an angle of 30° with its original direction of travel.
(a) Find the angle between the velocity vectors of the two balls after the collision.
°
(b) Find the speed of each ball after the collision.
cue ball m/s
target ball m/s

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