Calculating the loss in mechanical energy due to a collision

[NRasmus1]

Ballistic Pendulum system. Bullet weighs .00500kg and the wooden block it hits weighs 1.00kg. The increase in height is .05m. Using conservation of momentum and conservation of energy I have calculated the bullets speed at 199m/s. How can I calculate the loss in mechanical energy as a result of the collision?

The answer is 98.5 Joules. I have no idea where to start.

 

[Xisune]

What is the energy before the collision? and after the collision?