Homework Help: physics

Posted by Jess on Thursday, September 16, 2010 at 4:58pm.

A hockey puck moving due east with speed 1.00 m/s collides with an identical puck moving 40 degrees south of west with speed 2.00 m/s. After they collide, the first puck is moving south with speed 1.50 m/s. What is the direction and speed of the second puck?

physics - bobpursley, Thursday, September 16, 2010 at 6:16pm
break up each puck into N, E components. Then use the law of conservation of momentum in each direction.

N:
0-M*2sin40=-M*1.5+M*Xn
notice the M's divide out. Solve for Xn, the north component of the second puck.
E:
M*1-2Mcos40=0+MXe
solve for Xe, the east component of the second puck.

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