**AP Physics 1 Question 443: Answer and Explanation**

### Test Information

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**Question: 443**

**1.** A soldier loads a 10 kg cannonball into a 300 kg cannon that is initially at rest on the ground. What is the recoil speed of the cannon if the cannonball is fired with a horizontal velocity of 300 m/s ?

- A. 5 m/s
- B. 7.5 m/s
- C. 10 m/s
- D. 15 m/s

**Correct Answer:** C

**Explanation:**

**C**

As the cannon and cannonball are both initially at rest, the total initial momentum is 0. By Conservation of Linear Momentum, the total final momentum must also be equal to 0.