Question

Two identical pucks collide on an air hockey table. One puck was originally at rest. If...

Two identical pucks collide on an air hockey table. One puck was originally at rest. If the incoming puck has a velocity of 7.10 m/s along the +x-axis and scatters to an angle of 36.0° above the +x-axis, what is the velocity (magnitude and direction) of the second puck? (You may use the result that θ1 − θ2 = 90° for elastic collisions of objects that have identical masses.)


Velocity (magnitude) =
Velocity (direction) = below +x-axis

What is the kinetic energy before and after the collision if the mass of each puck is 0.15 kg? (The collision is elastic.)


Kinetic energy before collision =

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