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

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The discussion focuses on solving a momentum problem involving a 100 kg cannon and a 10 kg cannonball, where the cannonball is fired at a velocity of 150 m/s. The key equation used is the conservation of momentum, expressed as Vm1(initial) + Vm2(initial) = Vm1(final) + Vm2(final). The initial momentum is zero since both the cannon and cannonball are at rest, necessitating that the final momentum must also equal zero. The discussion emphasizes that conservation of energy is not applicable in this scenario.

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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.
 
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Initially nothing is moving, so the whole left side is zero.
Put your numbers in the right side.
 
initial momentum is zero. so final also has to be zero.
here you CANNOT use conservation of energy
 

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