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A bullet (m = 0.04kg) with a velocity of 285m/s hits a block (M = 2.3kg)...

A bullet (m = 0.04kg) with a velocity of 285m/s hits a block (M = 2.3kg) that is initially at rest.  The bullet passes through the block and emerges with a velocity of 85m/s.  

(a) What is the velocity of the block after the bullet leaves it?

(b) What is the total kinetic energy of this system before the collision?

(c) What is the total kinetic energy of this system after the collision?

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