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On the diametrically opposite points, the velocities have the same magnitude but opposite directions. What is the change in momentum?

1. MV − (−MV) = 2MV
2. MV − MV = 0
3. Change in momentum is MV − (−MV)
4. Momentum is conserved

Correct answer: MV − (−MV) = 2MV

Solution

The momentum at one point is MV, and at the diametrically opposite point, it is -MV (opposite direction). The change in momentum is calculated as final momentum minus initial momentum, which is MV - (-MV) = 2MV.

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