AP Physics 1 Question 443: Answer and Explanation

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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



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.