Originally Posted by

**Jock** A horizontal force of 80 N acts on a mass of 6 kg resting on a horizontal

surface. The mass is initially at rest and covers a distance of 5 m in 0.92 s

under the action of the force. Assuming there are no energy losses due to

air resistance and therefore that the acceleration is constant:

(a) Calculate the total energy expended in the acceleration.

(b) Plot a graph of the kinetic energy of the mass against time.

(c) Plot a graph of the kinetic energy of the mass against distance.

(d) Calculate the coefficient of friction between the mass and the surface. Any help with this would be great. Only got bits for (a) velocity = 5.435