A block of mass m 4.2 kg moving on a frictionless surface, Ask an Expert

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Q1. A block of mass m = 4.2 kg, moving on a frictionless surface with a Vi=2.9m/s speed makes a perfectly elastic collision with a block of mass M at rest. After the collision, the 4.2 block recoils with a speed of 0.9m/s. The mass M is closest to?

Q2. A 22 g bullet travelling 210 m/s penetrates a 2.0 kg block of wood and emerges going 150 m/s. If the block is stationary on a frictionless surface when hit, how fast does it move after the bullet emerges?

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