PLEASE HELP ill also answer questions that you have posted if you answer these correctly (30pts)

A50.0-n box is sliding on a rough horizontal floor, and the only horizontal force acting on it is friction. you observe that at one instant the box is sliding to the right at and that it stops in 2.25 s with uniform acceleration. what magnitude force does friction exert on this box

In the image, the arrow is pointing to a celestial object. which attribute disqualifies the object from being a planet?

Awave is produced in a rope. the wave has a speed of 33 m/s and a frequency of 22 hz.