Which of the following statement is // are trueA. work done by kinetic friction on a rigid body may be positiveB. a uniform sphere rolls up an inclined plane without sliding. The friction force on it will be up the incline. (only contact force and gravitational force is acting)C. a uniform sphere rolls down an inclined plane without sliding. The fricition force on it will be up the incline. (only contact force and gravitational force is acting)D. a uniform sphere is left from rest from the top of rough inclined plane. It moves down the plane with slipping. The friction force on it will be up the incline.

Which of the following statement is // are trueA. work done by kinetic

1.	Which of the following statement is // are trueA. work done by kinetic friction on a rigid body may be positiveB. a uniform sphere rolls up an inclined plane without sliding. The friction force on it will be up the incline. (only contact force and gravitational force is acting)C. a uniform sphere rolls down an inclined plane without sliding. The fricition force on it will be up the incline. (only contact force and gravitational force is acting)D. a uniform sphere is left from rest from the top of rough inclined plane. It moves down the plane with slipping. The friction force on it will be up the incline.
Answer» Correct Answer - A::B::C::D `w=intf_(k)dvec(s) gt0 If `f_(k)` and ds looth are parallel to each other friction force acts up to the inclined to produce angular acceleration.

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