1. Two small cars are connected by a spring of negligible mass. Both cars are moving in the positive direction at 2.5 m/s. Car A has a mass of 2.4 kg. The spring pushes the masses apart and, after the spring expands, Car A is moving
at 3.1 m/s in the positive direction and Car B is moving at 2.1 m/s in the positive direction. Assume the track to be
frictionless and horizontal and that there are no net forces external to the system.
A. What is the mass of Car B?
B. What was the impulse that acted on Car A?
C. What was the net work done on car A?

the answer is a. the yacht traveled from the dock north to the 200-meter marker in the bay in less than 5 minutes, giving the passengers several more hours to fish.

im doing peak rn so sry if its wrong

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.