Find the momentum for a 2.6-kg brick parachuting straight downward at a constant speed of 8.4 m/s .

In Newtonian mechanics, the momentum is the product of the mass (m) and velocity (v) of an object.

in unit (kg.m/s)

in our problem, we have a mass (m) = 2.6 kg and a velocity (v) = 8.4 m/s

thus

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.