A 10 kg go-cart is moving at a speed of 3 ms what is its energy?

The Kinetic energy (KE) of the go-cart can be calculated through knowing is mass and velocity. KE = 1/2 times both mass and velocity squared. The units are KE in joules, mass in kilograms, and velocity in meters per second. If you round to one significant figure this go-carts KE is 50-joules.