Question

A box of mass 1 kg is pulled on a horizontal plane of length 10m by a force of 80 n then it is raised vertically to a height of 5m, the net work done is

Answer 1

This question might seem a bit tricky but can easily be solved in a two step process.

First, we will calculate the work done during the horizontal displacement of 10m with the help of the force of 80N.

Work Done = w = Force * Displacement

Work Done = w = 80 N * 10 m/s = 800J

Second, we will calculate the gain in the Gravitational Potential Energy in of the body, which will indeed be equal to the work done on the body in the vertical direction,

Gravitational Potential Energy = Mass * Acceleration due to gravity * Height

Gravitational PE = m g h

Gravitational PE = 1 * 10 * 5 (Assuming g to be equal to 10)

Gravitational PE = 50J = Work done vertically.

So this way the total work done on the body

= w + Gravitational PE

= 800J + 50J

= 850J

Best of Luck,

SamSax.