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=(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=(1)/(2)\cdot m\cdot v^2 \\ KE=(1)/(2)\cdot880\cdot(15)^2 \\ KE=(1)/(2)\cdot880\cdot225 \\ KE=(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