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...give me the solution? A rocket, starting from rest in deep space, with an initial mass of M and a final mass of 0.2 M attains a speed of 3200 m/s. What is the exhaust velocity of the rocket? I know the answer is 2000 m/s, I just need the solution. please help me. (Please give me serious...

please tell me the solution? A 20 g bullet moving at 100 m/s is fired at a 1 kg block of wood initially at rest and free to move.The bullet emerges from the other side at a speed of 100 m/s.What is the resultant speed of the wood block? ** I know the final answer is 18, but I don't know the...

A 20 g bullet moving at 100 m/s is fired at a 1 kg block of wood initially at rest and free to move.The bullet emerges from the other side at a speed of 100 m/s.What is the resultant speed of the wood block? ** I know the final answer is 18, but I don't know the solution Please help me and...