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A block with mass m1 = 10 kg moving at 5 m/s collides with another block...

A block with mass m1 = 10 kg moving at 5 m/s collides with another block with mass m2 = 20 kg moving the other way at 1 m/s. The two blocks stick together after the collision.

(a) What is their common final velocity, vf ?

(b) The blocks collide again, this time elastically. Assume that the outgoing blocks move away from the collision along the initial line of approach. What are the final velocities, v1f and v2f ?

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