A man of mass of 80kg carries a load of bricks of mass 20kg up a vertical ladder of length 6m.what work has he done?

Answer 1

The work done by the man is equal to the change in potential energy of the load, which can be calculated using the formula:

work = force x distance x cos(theta)

where force is the weight of the load (mg), distance is the height climbed (which is equal to the length of the ladder, 6m), and theta is the angle between the force and the direction of motion (which is 0 degrees since the force is vertical and the motion is also vertical).

So, the work done is:

work = (20kg x 9.8m/s^2) x 6m x cos(0) = 1176 Joules

Therefore, the man has done 1176 Joules of work in carrying the load of bricks up the ladder.