A600 kg car is at rest, and then accelerates to 5 m/s. what is its original kinetic energy? j what is its final kinetic energy? j how much work was used? j

1) Original kinetic energy: 0

The kinetic energy of an object is given by:

where m is the mass of the object and v the speed of the object.

In this problem, the mass of the car is m=600 kg, but its initial speed is zero (it is at rest), so v=0 and Ki=0.

2) Final kinetic energy: 7,500 J

Using again the formula for the kinetic energy:

And using the mass of the car (m=600 kg) and its final speed (v=5 m/s), we find

3) Work used: 7,500 J

The kinetic energy theorem states that the work done on an object is equal to its gain in kinetic energy:

Using the kinetic energies found in the previous points, we find the work done

option number c is the right answer.