Question

During a military muster, a bombardier uses a 1480 kg cannon on wheels to fire a 60 kg cannonball horizontally. The bombardier notices that the cannon rolls back at a velocity of 1.8 m/s. With what velocity was the cannonball fired from the cannon?

Your Answer:

Answer 1

Apply momentum conservation:

$$0=mv-Mu,\\\space\\ v=Mu/m=167\text{ m/s}.$$