A65.2-kg skier coasts up a snow-covered hill that makes an angle of 33.3 ° with the horizontal. the initial speed of the skier is 8.05 m/s. after coasting a distance of 1.26 m up the slope, the speed of the skier is 4.54 m/s. (a) find the work done by the kinetic frictional force that acts on the skis. (b) what is the magnitude of the kinetic frictional force?

a) -999J

b) -793N

Explanation:

We need to apply the conversation of energy equation, we will take the potencial energy at the bottom as zero.

now rearranging the equation:

we know that work is:

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.