At what speed will a body weighing 5 kg have an energy of 250 J?

Given:

m = 5 kilograms – the mass of a certain body;

E = 250 Joules – body energy.

It is required to determine v (meter per second) – at what speed the body will have energy E.

Since it is not specified in the problem statement, we assume that E is kinetic energy. Then, to determine the speed of the body, you must use the following formula:

E = m * v ^ 2/2, from here we find that:

v = (2 * E / m) ^ 0.5;

v = (2 * 250/5) ^ 0.5 = (500/5) ^ 0.5 = 1000.5 = 10 meters per second.

Answer: the body will have a kinetic energy of 250 Joules at a speed of 10 meters per second.