Question

A man carries 20 tiles from the ground to the roof of a house. Each tile has a mass of 1.2 kg. The roof of the house is 15 m above the ground.How much work does the man do against gravity on the tiles in carrying them to the roof?

Answer 1

3531.6 J

Step-by-step explanation:

Work = Force x distance

the force is equal to the gravitational force, which is mg.

the distance equals the height h

W = mg x h = (1.2)(9.81)(15) = 176.58 J

but, this is only the work on 1 tile, so we multiply this by 20 to get 3531.6 J