Ok, this is probably the simplest problem I was assigned out of an intro physics course and simply cannot figure out how to go about it.(adsbygoogle = window.adsbygoogle || []).push({});

Hockey Puck B at rest is struck by puck A, which was traveling at 40.0m/s in the +x direction. After they hit, A is deflected 30 degrees above the x axis, and Puck B acquires a velocity at 45 degrees below the x axis. The pucks have the same mass and friction forces aren't considered.

a) The speed of each puck after collision

b) what fraction of the original kinetic energy of puck A dissipates during the collision

I have the solutions, but can't figure out how to solve for them. Yes, I suck at physics :( Any help would be appreciated.

Since the message says solutions can't be solved for us, just a hint on where to start would be useful. I'm just ending up with ridiculous equations with sin/cos trying to account for the conservation of momentum.

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# Homework Help: Conservation of momentum

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