Question

Wat is the mass of the car that has kinetic energy of 2400J and is moving with a speed of 20 m\s

Answer 1

Given,

The kinetic energy of the car, E=2400 J

The speed of the car, v=20 m/s

Kinetic energy is the energy that is possessed by an object due to its motion.

It is given by,

`E=(1)/(2)mv^2`

Where m is the mass of the car.

On substituting the known values in the above equation,

`\begin{gathered} 2400=(1)/(2)* m*20^2 \\ m=(2*2400)/(20^2) \\ =(4800)/(400) \\ =12\text{ kg} \end{gathered}`

Thus the mass of the car is 12 kg