20. Small block A sits on top of large block B, as shown in the diagram. Both blocks are being pulled to the right along a flat surface by a horizontal pull of 100 N. as shown in the figure. Both blocks are moving together at a constant velocity of 2.0 m/s to the right, and both have the same weight. Which free-body
diagram shows the horizontal forces acting on the upper block, A?

ammonium chloride & tallow

probably not if net force is zero

do you have a formula possibly

russian is not my first language, so i'm afraid i can't write out an answer in russian, but hopefully you can find a way to do so. here's my best translation of the problem: you're given a plot of a particle's position in one-dimensional space over time, and you're asked to find either the total distance traveled by the particle after 6 seconds had elapsed, or the total displacement of the particle after 6 seconds.

if you want the total distance traveled, you would first need to determine the particle's velocity as a function of time, then integrate that over the 6-second interval. we know the position function is quadratic with roots at 0 and 6, so we have

where is unknown. because the position is parabolic, there is symmetry about the midpoint at , and we know that

so that the position function is

which means the velocity is

then the total distance traveled is

so the total distance traveled is 20 m.

on the other hand, if you want to find displacement: the particle starts at and ends at , so its displacement is 0.