A car traveling with 500,000 J of kinetic energy is brought to a kinetic energy of 100,000 J in 12 seconds. What is the force acting on the car to accomplish this?

A:41,666.67
B:3x10^-5N
C:33,333.33N
D:8,333.33N

33,333.33 N

Explanation:

Given that :

Initial kinetic energy = 500,000 J

Final kinetic energy = 100,000 J

Using the relation :

Force * time = change in momentum (Newton's law)

Force (F) * 0.12 = (500,000 - 100,000)

0.12F = 400,000 J

Force = (400,000 J) / 0.12s

Force = 33333.333

Force = 33,333.33 N

f=ma newton's second law 7x8=56n