A box is pulled with a force of 25 N to produce a displacement of 15 m. If the angle between the force and displacement is `30^(@)`. Find the work done by the force ?

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

If the angle between force and displacement is acute then the work done is

Solve the following examples: When a force of 20 N acts on a body, the body is displaced by 5 m. If the angle between the force and displacement is 60° , find the work done by the force.

In case of negative work, the angle between the force and displacement is

In case of negative work the angle between the force and displacement is

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

If the force and the displacement are at an angle of 180^(@) , then work done is: