4. A car of mass 1200 kg travelling at 20 m/s brakes and comes to rest in 4 seconds. What is the average force exerted by the brakes on the car?*

The car has an average acceleration of

Then, by Newton's second law, the average force exerted by the brakes on the car is

which is to say, the average force has a magnitude of 6000 N and is directed opposite the car's motion.

get the total number of pieces of fruit and divide it by 4 to get the average. the result is the answer to the problem. 14 total number of fruits and there are 4 members. 14 divided by 4 is equals to 3.5.

there are no contact forces mentioned on the list of choices that you've provided.