Which action demonstrates increasing the resistance of a movement by lengthening the distance between the join and movement? a. doing a sit up with arms on the forehead after sitting up with arms behind head b. lifting dumbbell weight at 20-degree angle from the body after a 45-degree angle c. rising from a wide-leg squat after rising from a closed leg squat

b. lifting dumbbell weight at 20-degree angle from the body after a 45-degree angle

i don't understand is there any other way you can rephrase it plz let me know in the comments and i will do it.

explanation:

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.