The car is driving down the road with a kinetic energy of 56J. What is its new kinetic energy now if its velocity is doubled?

The new kinetic energy is 224 J

Explanation:

Recall that kinetic energy is defined as:  where m is the mass of the object and v its velocity. So the initial situation is that the car has a kinetic energy equal to 56 J when its velocity is "v". Therefore, at this initial velocity, the kinetic energy of the car is;

in the new new situation, the car has doubled its velocity: from went to , without any change in its mass. This means that its new kinetic energy is now given by:

which is four times its initial kinetic energy. That is: 4 * 56 J = 224 J

your answer is c! hope this : )

i think the answer is a, hope this : )