Solving Kinetic Energy of Block After Bullet Passes Through

[DPatel304]

Stuck on this one problem which states:
A bullet with a mass of 6.00 g, traveling horizontally with a speed of 370 m/s, is fired into a wooden block with mass of 0.750 kg, initially at rest on a level surface. The bullet passes through the block and emerges with its speed reduced to 120 m/s. The block slides a distance of 49.0 cm along the surface from its initial position.
Use g = 9.81 m/s^2 for the acceleration due to gravity.And I am trying to find this:
What is the kinetic energy of the block at the instant after the bullet passes through it?

If more information is needed, I can post it. Thanks in advance for your help.

Btw, the first portion of the question asked for the coefficient of friction, which I was able to get:
What is the coefficient of kinetic friction between block and surface?
0.416

and this:
What is the decrease in kinetic energy of the bullet?
368 J

 

[Hootenanny]

Can you find an expression for conservation of energy of the system?

Of course we are ignoring any deformation of the block or bullet.