Question

A car with mass 450 kg has a kinetic energy of 16,256 j. What is the speed of the car?

Answer 1

Answer:

Speed of the car is 8.49 m/s

Explanation:

It is given that,

Mass of the car, m = 450 kg

Kinetic energy of the car, E = 16256 J

We need to find the speed of the car. The kinetic energy of the car is given by :

$E=\dfrac{1}{2}mv^2$

$v=\sqrt{\dfrac{2E}{m}}$

$v=\sqrt{\dfrac{2\times 16256\ J}{450\ kg}}$

v = 8.49 m/s

So, the speed of the car is 8.49 m/s. Hence, this is the required solution.

Answer 2

E = 1/2 * m * v²

v = √(2 * E  / m)