Find what the work done when lifting a 4kg box to a height of 2.5m is equal to.

Task data: m (weight of the lifted box) = 4 kg; h (lifting height) = 2.5 m.

Reference values: g (acceleration due to gravity) ≈ 10 m / s2.

The work done when lifting the box in question will be equal to the change in its potential energy: A = ΔEp = m * g * h.

Let’s calculate: A = 4 * 10 * 2.5 = 100 J.

Answer: When lifting the box in question, a work of 100 J.