A. The speed of the car and riders (total mass = 350.0 kg) at the top of the first hill, Point A, is 4.00 m/s.
What is the speed at Point B, 5.00 m below Point A.
b. The top of the second hill, Point C, is 8.00 m above Point B. Is the roller coaster moving fast enough to
make it to the top of the second hill?
Calculate the minimum speed required at Point B in order for the rollercoaster to reach the top of the
second hill, Point C.
c.
d.
Did you need to know the mass of the car and
riders in order to answer this question? Explain.

8 meters above the spring

the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

hope this !

im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.