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**[SOLVED] Deflection Angle**

Hey guys, back again lol, got a really quick question:

In order to convert a tough split in bowling it is necessary to strike the pin a glancing blow as shown. Assume that the bowling ball, initially travelling at 12.0 [m/s], has five times the mass of the pin and that the pin goes off at 80[degrees] from the original direction of the ball. Calculate the speed A) of the pin and B) of the ball just after collision and C) calculate the angle through which the ball as deflected. Assume the collision is elastic and ignore any spin of the ball.

So far I've done part A and part B, but I'm ashamed to say I'm having trouble calculating the angle. Do I make a resultant triangle? A point in the right direction would be great

^ ^ thank you!

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