A-LevelPhysicsDynamics9702/12 · May/June 2010 · Q101 Mark

The diagram shows two identical spheres X and Y. [Figure 10.1] Initially, X moves with speed v directly towards Y. Y is stationary. The spheres collide elastically. What happens?

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AX moves with speed ½ v to the right, Y moves with speed ½ v to the right

BX moves with speed ½ v to the left, Y remains stationary

CX moves with speed ½ v to the left, Y moves with speed ½ v to the right

DX stops, Y moves with speed v to the right

✓ Correct answer

D: X stops, Y moves with speed v to the right

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