# Cannon in a railway carriage; recoil

1. Oct 12, 2011

### drunkenrobot

1. The problem statement, all variables and given/known data

A cannon is bolted to the floor of a railway carriage, which is free to move without friction along a straight track. The combined mass of the cannon and carriage is M=1200 kg. The cannon fires a cannonball, of mass m=1.2 kg, horizontally with velocity v=115 m/s. The cannonball travels the length of the carriage, a distance of 85 m, and becomes embedded in the carriage's end wall.

a. What is the recoil speed of the carriage right after the cannon is fired?

b. what is the velocity of the carriage after the cannonball strikes the far wall?

c. what net distance does the carriage move as a result of the firing of the cannon?

2. Relevant equations

dont know

3. The attempt at a solution

I really don't know how to start this problem.

2. Oct 12, 2011

### DukeLuke

Can you apply conservation of momentum to the system before and after the cannon is fired?