Find the kinetic energy of an 800 kg car traveling at 60 km / h.

We believe that the movement of the car takes place in a closed system. For a closed system, kinetic energy Ek = (mV ^ 2) / 2, where, from the conditions of the problem, Ek is the kinetic energy of a moving vehicle, V is the vehicle speed (60 km / h), m is the mass of the vehicle.
Let’s translate the speed of the car from km / h to m / s: 1 km = 1000 m, 1 h = 3600 s.
60 km / h = 60 * 1000/3600 = 16.67 m / s.
Therefore:
Ek = (800 * 16.67 ^ 2) / 2 = (800 * 277.9) / 2 = 111160 J.
Answer: The kinetic speed of the car is 111160 J.