Solve Momentum Problem: 100kg Cannon+10kg Ball, 150m/s Velocity

[AnomalyCoder]

You load a 100 kg cannon with a 10kg cannonball. Initially the cannon is at rest. You fire the cannonball at a velocity of 150m/s.

Momentum = mass*velocity

Im having trouble coming up with the parts of the scenario, or splitting this story into pieces to solve this problem using: (Vm1(initial)+vm2(initial) = vm1(final) + vm2(final).

Any help and tips appreciated.

 

[Delphi51]

Initially nothing is moving, so the whole left side is zero.
Put your numbers in the right side.

 

[ashishsinghal]

initial momentum is zero. so final also has to be zero.
here you CANNOT use conservation of energy