Physics System of Particles Rotational Motion Combined Translational + Rotation Motion (Kinematics) MCQ (Single Correct)

A solid sphere rolls down on two different inclined planes of same height, but of different inclinations. In both cases

A
speed and time of descent will be same
B
speed will be same but time of descent will be different
C
speed will be different, but time of descent will be same
D
speed and time of descent both are different

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Verified by Experts
The correct answer is:
B

I n pure rolling, mechannical energy remains conserved. Therefore, when heights of inclines are equal, speed of sphere will be same in both the cases. But as acceleration down the plane, a ∝ sin θ therefore, acceleration and time of descent will be different.

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