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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 (S 45 W). Determine the final velocity of the second puck and explain if the collision is elastic, perfectly inelastic or non-perfectly elastic.

25

For this question my answer keeps on coming to 25m/s but answer is 28.

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