Question

If a car with a weight of 880 kg is moving with a speed of 15 m/s what is it's kinetic energy

Answer 1

The mass of the car is 880 kg and the speed of the car is 15 m/s

Recall that the kinetic energy is given by

$KE=\frac{1}{2}\cdot m\cdot v^2$

Where m is the mass and v is the speed of the car.

Let us substitute the given values into the above equation

$\begin{gathered} KE=\frac{1}{2}\cdot m\cdot v^2 \\ KE=\frac{1}{2}\cdot880\cdot(15)^2 \\ KE=\frac{1}{2}\cdot880\cdot225 \\ KE=\frac{1}{2}\cdot198,000 \\ KE=99,000\: \text{Joules} \end{gathered}$

Therefore, the kinetic energy of the car is 99,000 Joules.

Or you can say 99 KJ