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Which of the following statements is //a...

Which of the following statements is `//`are true.

A

workd done by kinetic friction on an object may be positive

B

A rigid body rolls up an inclined plane without sliding. The friction force on it will be upwards `(` only contact force and gravitational force is acting. `)`

C

A rigid body rolls down an inclined plane without sliding. The friction force on it will be upwards. `(` only contact force and gravitational force is acting `)`

D

A rigid body is left from set rest and having no angular velocity from the top of a rough inclined plane. It moves down the plane with slipping. The friction force on it will be upwards.

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The correct Answer is:
A, B, C, D
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