What work is done when lifting a granite slab weighing 1250kg to a height of 20m?

Initial data: m (mass of a granite slab) = 1250 kg; h (the height to which the granite slab must be lifted) = 20 m.

Reference values: g (acceleration due to gravity) = 9.8 m / s2.

If the movement of the granite slab was vertical (cosα = 1), then the formula for determining the work to lift it will look like: A = F * S = m * g * h.

Let’s calculate: A = 1250 * 10 * 20 = 245000 J = 245 kJ.

Answer: When a granite slab is lifted, a work of 245 kJ is performed.