Assertion : When a body rolls on a surface, the fore of friction acts in the same direction as the direction of motion of the centre of mass of the body.
The direction of motion of the centre of mass is the direction along which the body rolls.

Options

A. If both Assertion and Reason are true and Reason is the correct explanation of Assertion
B. If both Assertion and Reason are true but Reason is not correct explanation of Assertion.
C. If Assertion is true but Reason is false.
D. If both Assertion and Reason are false.

Answer

A

Explanation

A Since the force of friction is opposite to the direction of the velocity at the point of contact, the force of friction acts in the direction of motion of the centre of mass.