A1900 kg car slows down from a speed of 25m/s to a speed of 15m/s in 6.25s. how much work was done on the car

Explanation:

According to the work-energy theorem, the work done on the car is equal to its variation of kinetic energy:

where

m = 1900 kg is the mass of the car

vf = 15 m/s is the final speed

vi = 25 m/s is the initial speed

Substituting the data, we find

and the work is negative because it is done against the motion of the car (in fact, the car slows down, so it loses kinetic energy).

your answer is, orbit around the nucleus