A2 kg block is moving at a speed of 10 m/s and makes a perfectly elastic collision with a second block of mass M, which is initially at rest. After the collision, the 2 kg block bounces straight back at 3 m/s Determine the mass M of the second block. Express your answer with the appropriate units. ? M = Value Units Submit Request Answer Part B Determine the speed of the second block after the collision. Express your answer with the appropriate units. ? v = Value Units