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Question

A stationary cannon fires a cannonball. Which of the following is NOT true immediately after the cannonball is fired?

A
The cannon and cannonball do not have the same magnitude of momentum
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B
The force the cannon exerts on the cannonball is the same magnitude as the force of the cannonball on the cannon
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C
The impulse the cannon exerts on the cannonball is the same magnitude as the impulse the cannonball exerts on the cannon
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D
The cannon and cannonball do not have the same kinetic energy after firing
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E
The cannon and cannonball do not have the same kinetic energy before firing
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Solution

The correct option is B The cannon and cannonball do not have the same magnitude of momentum
Since no external force acts on the cannon-cannonball system during the process, the momentum of the system before and after the firing is constant.
Since the momentum before firing is zero,
0=pcannon+pcannonball
|pcannon|=|pcannonball|
Hence correct answer is option A.

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