Rotation 3 Question 4
10. A ball moves over a fixed track as shown in the figure. From to the ball rolls without slipping. If surface is frictionless and and are kinetic energies of the ball at and respectively, then
(a)
(b)
(c)
(d)
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Answer:
Correct Answer: 10. (d)
Solution:
- On smooth part
, due to zero torque, angular velocity and hence the rotational kinetic energy remains constant. While moving from to translational kinetic energy converts into gravitational potential energy. So, and .