To what height should a 5 kg load be lifted to increase its potential energy by 40 J?

In general, the potential energy can be calculated by the formula:

E = M x G x H,

where M is the mass of the load, H is the height, G is the acceleration of gravity.

From here:

H = E / (M x G).

Substitute the values and get the result:

H = 40 / (5 x 9.8);

H ≈ 0.82 (m).

Answer: in order for the potential energy to increase by 40 Joules, you need to raise this weight to a height of approximately 0.82 meters.