Disk P (inertia 0.39 kg) moves at an unknown velocity across a low friction hori

Question

Disk P (inertia 0.39 kg) moves at an unknown velocity across a low friction horizontal surface and collides with disk Q (inertia 0.65 kg), which is initially at rest. AFter the collision the two (now slightly dented) disks move apart without spinning. From the top view, When Q hits P, Q goes 50 degrees below horizontal with a speed of 0.96 m/s, and P goes 1.4 m/s at an angle of 20 above horizontal.

A. What was the initial velocity of disk P?

B. What fraction of the initial kinetic energy is converted during the collision? (Ki-Kf)/Ki

Explanation / Answer

Disk P (inertia 0.39 kg) moves at an unknown velocity across a low friction hori

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