Anet force of 3000 n is accelerating a 1200kg elevator upward. if the elevator starts from rest, how long will it take to travel up 15m?

3.46 s

Explanation:

First of all, we can calculate the acceleration of the elevator by using Newton's second law:

and the acceleration has the same direction of the net force (upward).

Now we can calculate the time takes for the elevator to cover a distance of S=15 m by using the following SUVAT equation:

where a is the acceleration and t the time. Re-arranging the equation, we find

prolly a beacuse the momentuem the car has increases while going down hill

i don't know that i agree with that but what's the question ?