There is a box weighing 20 kg on the floor. What work must be done to raise the box to a height of 2m?

Given: m (weight of the box in question) = 20 kg; h (height to which the box must be raised) = 2 m.

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

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

Calculation: A = 20 * 9.8 * 2 = 392 J.

Answer: When the box is lifted from the floor to a height of 2 meters, work is done at 392 J.