Question

A constant force of 10n displases a body through 5m find the work done by the force

Answer 1

Wok done by a force on a body is;

w= component of force in the direction of motion of the body ×displacement

=(Fcosθ)s=Fscosθ; where θis the angle

between the direction of force and the direction of motion. Here θ is 0 degree.  

So W=Fs=10×10 joules=100 joules.

According to the law of conservation of energy, work done by the force should increase the kinetic energy of the body, but here the body is moving with the constant velocity. It means work done by the force is being used to overcome some opposing force and that opposing force may be the kinetic friction between body and the rough surface on which it is moving.

Answer 2

Answer:

work done = force * displacement

Explanation:

So , 5 m * 10 n = 50 mn or 50 J ( Joules )