Question

A car has a mass of 1000 kg and a momentum of 12000 kg m/s. What is its kinetic energy

Answer 1

The kinetic energy of the car is 72 kJ.

Explanation:

Given that,

Mass of the car, m = 1000 kg

Momentum of the car, p = 12000 kg m/s

The kinetic energy and the momentum of the object is given by :

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

$p=m\times v$

On solving,

$K=\dfrac{p^2}{2m}$

$K=\dfrac{(12000 )^2}{2\times 1000}$

K = 72000 Joules

or

K = 72 kJ

So, the kinetic energy of the car is 72 kJ. Hence, this is the required solution.

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