I had a two-part question but I've figured out the first part. A cannon with mass of 1960 kg fires a 24.5 kg ball horizontally. The cannonball has a speed of 120 m/s after it has left the barrel. For the first part I found that if the cannon was free to roll horizontally, its speed immediately after it was fired was 1.4907 m/s. The part I'm stuck on says imagine the same charge is used so total energy of cannon plus cannonball system is the same. Disregarding friction how much faster would the ball travel if the cannon were mounted rigidly and all other parameters remained the same? Answer in units of m/s.