What are the speed and momentum of a body with a mass of 2.5 kg and a kinetic energy of 20J?

Given:

m = 2.5 kilograms is the mass of a certain body;

E = 20 Joules is the kinetic energy of this body.

It is required to determine v (meter per second) – the speed of the body, as well as p (kg * m / s) – its impulse.

The body speed will be equal to:

v = (2 * E / m) ^ 0.5 = (2 * 20 / 2.5) ^ 0.5 = (40 / 2.5) ^ 0.5 = 16 ^ 0.5 = 4 m / s …

Then, to determine the impulse of the body, you must use the following formula:

p = m * v = 2.5 * 4 = 10 kg * m / s.

Answer: the speed of the body is 4 m / s, the momentum of the body is 10 kg * m / s.