Question

A 60 kg runner has 1500 J of kinetic energy. How fast is he moving?

Answer 1

The speed with which runner is running is 7.07m/s

Explanation:

Given:

Mass, m = 60kg

Kinetic energy, KE = 1500J

Velocity, v = ?

We know,

Kinetic energy = $\frac{1}{2} mv^2$

On substituting the value we get,

$1500 = \frac{1}{2} X 60 X v^2\\\\v^2 = 50\\\\v = 7.07 m/s$

Therefore, the speed with which runner is running is 7.07m/s