Laws of Motion - Result Question 64

64. 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, its

[1992]

(a) kinetic energy changes by MV2/4

(b) momentum does not change

(c) momentum changes by 2MV

(d) kinetic energy changes by MV2

Show Answer

Answer:

Correct Answer: 64. (c)

Solution:

  1. (c) On the diametrically opposite points, the velocities have same magnitude but opposite directions. Therefore, change in momentum is MV−(−MV)=2MV
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