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Disk 1 (of inertia m) slides with speed 4.0 m/s across a low-friction surface and collides...

Disk 1 (of inertia m) slides with speed 4.0 m/s across a low-friction surface and collides with disk 2 (of inertia 2m) originally at rest. Disk 1 is observed to turn from its original line of motion by an angle of 20 ∘, while disk 2 moves away from the impact at an angle of 55 ∘.

1. Calculate the final speed of disk 1

2. Calculate the final speed of disk 2.

3. Is this collision elastic?

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