A particle of mass M is moving in a horizontal circle of radius R with uniform speed V. When it moves from one point to a diametrically opposite point, is
A
Kinetic energy changes by MV24
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B
Momentum does not change
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C
Momentum changes by 2MV
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D
Kinetic energy changes by MV2
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Solution
The correct option is D Momentum changes by 2MV On the diametrically opposite points, the velocities have same magnitude but opposite directions. Therefore, change in momentum is MV−(−MV)=2MV
kinetic energy remain same as speed is same at every point