Quote (saber_x3 @ Jan 25 2014 07:26pm)
<> ????
At first glance, yes. But that isn't correct.
The puck is traveling in the z direction, and (a) asks for the momentum change in the direction of movement (the z direction) so the answer is simply 0.8.
(b) asks for change in momentum perpendicular to direction of movement, so answer is 1.5.