Assertion : When the force retards the motion of a body, the work done is zero. Reason : Work done depends on angle between force and displacement.

If the work done is zero, then the angle between the force and displacement is

Assertion : Work done by friction on a body sliding down an inclined plane is positive. Reason : Work done is greater than zero, if angle between force and displacement is acute or both are in same direction.

Maximum work will be done if the angle between force applied and displacement produced is

The work done on the object is negative, then the measure of angle between force and displacement would be …………