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**1. Jamie and Adam fire a cannon with a mass of 1150 kg. As the 14.5 kg cannonball leaves the cannon, the cannon recoils with a velocity of 1.75 m/s. How fast does the cannonball fly?**

2. A 45 kg cart rolls along a railroad track at 4.0 m/s. A dog running at 7.6 m/s to catch up with the cart jumps on the cart. After the dog jumps on the cart, the cart is moving at 6.0 m/s. What is the mass of the dog?

2. A 45 kg cart rolls along a railroad track at 4.0 m/s. A dog running at 7.6 m/s to catch up with the cart jumps on the cart. After the dog jumps on the cart, the cart is moving at 6.0 m/s. What is the mass of the dog?

**2. m1v1 + m2v2 = (m1+m2)Vf**

m1v1 + m2v2 = m1v1 + m2v2

(m1 + m2)*Vi = m1v1 + m2v2

m1v1 + m2v2 = m1v1 + m2v2

(m1 + m2)*Vi = m1v1 + m2v2

**3. I'm not sure what equation to use...**