A-LevelPhysicsDynamics9702/12 · May/June 2013 · Q131 Mark

All external forces on a body cancel out. Which statement must be correct?

AThe body does not move.

BThe momentum of the body remains unchanged.

CThe speed of the body remains unchanged.

DThe total energy (kinetic and potential) of the body remains unchanged.

✓ Correct answer

B: The momentum of the body remains unchanged.

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