Which type of friction prevents an object from moving? a. kinetic friction b. static friction c. rolling friction d. fluid friction

Static friction.

Explanation:

The answer is static friction.

It is a kind of friction that prevents an object from moving or you can say it is a force that keeps and object at rest.

On the other hand kinetic friction is that when an object is moving with an velocity and the surface is opposing its motion.

Rolling friction oppose motion of an rolling object.

Fluid friction is produced by fluid to oppose motion of other objects in that fluid medium.

most of them using statistics and defining how things are being measured

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.