A 2 kg block is moving at a speed of 10 m/s and makes a perfectly elastic collision with a second block of mass MM, which is initially at rest. After the collision, the 2 kg block bounces straight back at 3 m/s Part A Determine the mass MM of the second block. Express your answer with the appropriate units. Part B Determine the speed of the second block after the collision. Express your answer with the appropriate units.

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