a car moving at a speed of 50 km/h has a kinetic energy of x,what kinetic energy will it have when moving at 100 km/h?

Question

If a car moving at a speed of 50 km/h has a kinetic energy of x, what kinetic energy will it have when moving at 100 km/h?

Answer 1

As it is the same car in the equation Ek = 1/2 m v^2
Then 1/2m is constant and can be removed.
Therefore doubling v and v being squared gives a solution of Ek=4x.

Hope that helps.