A 50 kg cannonball hits a 12,000 kg tank that is initially at rest. The cannonball embeds into the tank, and both move at the same velocity for 50 cm until coming to rest. The coefficient of friction between the tank and the pavement is 0.45.

A. How much work does friction do on the system?

B. What is the velocity of the system right after the cannonball became embedded in the tank?

C. What is the initial velocity of the cannonball?