At what speed did a car with a mass of 2 tons move if its kinetic energy is 100 kJ.

To find the speed with which the car was moving, we will use the formula: Ek = m * V ^ 2/2, whence we express: V = √ (2Ek / m).

Values of variables: Ek – kinetic energy (Ek = 100 kJ = 100 * 10 ^ 3 J); m is the mass of the car (m = 2 t = 2 * 10 ^ 3 kg).

Let’s calculate: V = √ (2Ek / m) = √ (2 * 100 * 10 ^ 3 / (2 * 10 ^ 3)) = 10 m / s.

Answer: The car was moving at a speed of 10 m / s.