A rock with a mass of 55 kg is on top of a cliff that is 27 m high. Calculate the gravitational potential energy of the rock. A 14553 J
B. 145.5 J
c. 91.8 J
D. 2.3 J

A. 14553 J

Explanation:

GPE (Gravitational Potential Energy) = mgh

m = 55

g = 9.8 m/s²

h = 27

GPE = 55(9.8)(27) = 14553 J

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.