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bullet hitting a wooden block

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A bullet with a mass of 3.00 g, traveling horizontally with a speed of 420 m/s, is fired into a wooden block with mass of 0.840 kg , initially at rest on a level surface. The bullet passes through the block and emerges with its speed reduced to 180m/s . The block slides a distance of 48.0 cm along the surface from its initial position.

A) What is the coefficient of kinetic friction between block and surface?

B) What is the decrease in kinetic energy of the bullet?

C) What is the kinetic energy of the block at the instant after the bullet passes through it?

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Energies and friction
A bullet with a mass of 3.00 g, traveling horizontally with a speed of 420 m/s, is fired into a wooden block with mass of 0.840 kg, initially at rest on a level surface. The bullet passes through the block and emerges with its speed reduced to 180m/s. The block slides a distance of 48.0 cm along the surface from its initial position.

First we need to velocity of the block at the instant after the bullet passes through it using the conservation of momentum:
mv_1=mv_2+Mv
Where v1 and v2 are the velocities of the bullet before and after it ...

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