Two hockey pucks of equal mass approach each
other. Puck 1 has an initial velocity of 20.0 m/s [S
45° E], and puck 2 has an initial velocity of 15 m/s
[S 45° W]. After the collision, the first puck is
moving with a velocity of 10.0 m/s [S 45° W].
(a) Determine the final velocity of the second
puck.
(b) Is this collision elastic, perfectly inelastic, or
(non-perfectly) inelastic? Explain your reasoning.