Question

A car with a mass of 500 kg contains 2600 J of kinetic energy. Calculate the speed of the car.

Answer 1

$$KE=\dfrac{1}{2}mv^2,$$ $$v=\sqrt{\dfrac{2KE}{m}},$$ $$v=\sqrt{\dfrac{2\cdot2600\ J}{500\ kg}}=3.22\ \dfrac{m}{s}.$$