Jane is in a shiny sports car at the top of a 100m vertical cliff over looking the Pacific Ocean. It has a potential energy of 20,000 J relative to the ground below. Unfortunately, Jane while looking at the scenery, takes her foot off the brake and it rolls over the cliff. When it is halfway to the ground, its kinetic energy is? Gravity= 10 m/s2. KE=1/2*m*V2

568.98

explanation:

its math

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.

the speed of the cart after 3 seconds of low fan speed is ⇒ 54.0 cm/s.

the speed of the cart after 5 seconds of medium fan speed is ⇒ 120.0 cm/s.

the speed of the cart after 2 seconds of high fan speed is ⇒ 64.0 cm/s. 

just did the lab.