The material point moves along the oh axis according to the law: x = 3t.

The material point moves along the oh axis according to the law: x = 3t. What is the speed of a material point? How can it pass in 3 seconds of movement?

Solution.
A material point moves along the Ox axis, its coordinate changes according to the law: x = 3 ∙ t. Comparing this formula with the general equation of a uniformly moving body x = v ∙ t, where v is the speed of the body, t is the time of its movement, we find the speed of a material point v = 3 m / s. If the time of movement is t = 3 seconds, then the material point will cover the path:
x = 3 ∙ 3;
x = 9 (meters).
Answer: in 3 seconds of movement, let the material point pass 9 meters; the speed of a material point is 3 meters per second.