Question

A trolley of mass 7 kg is moving with the speed of 1.5 m/s. Calculate the kinetic energy of the trolley.

Answer 1

$$KE=\dfrac{1}{2}mv^2,$$ $$KE=\dfrac{1}{2}\cdot7\ kg\cdot(1.5\ \dfrac{m}{s})^2=7.87\ J.$$