Question

A curling rock with a mass of 20.0 kg slides down a sheet of ice at a speed of 6.00 m/s. What is the kinetic energy of the curling rock?

Answer 1

By definition, the kinetic energy is

$$K = \dfrac{mv^2}{2}$$

where $m = 20kg$ is the mass of the rock, and $v = 6m/s$ is its speed. Thus, obtain:

$$K = \dfrac{20\cdot 6^2}{2} = 360J$$

Answer. 360 J.