The projection of the speed of a body moving in a straight line changes according to the law Vx = 4 = 0.5t.

The projection of the speed of a body moving in a straight line changes according to the law Vx = 4 = 0.5t. What is the speed of the body in 10 s from the beginning of movement?

Since there are inaccuracies in the conditions of the problem, we will solve it for two options.

Given:

Option a) v (t) = 4 – 0.5 * t – the equation of the dependence of speed on time;

Option b) v (t) = 4 + 0.5 * t – the equation of the dependence of speed on time;

t = 10 seconds – time span.

It is required to determine v (meter per second) – the speed of the body through the time interval t after the start of movement.

For option a):

v = 4 – 0.5 * 10 = 4 – 5 = -1 meter per second.

For option b):

v = 4 + 0.5 * 10 = 4 + 5 = 9 meters per second.

Answer: the speed of the body 10 seconds after the start of movement will be equal to: a) -1 m / s, b) 9 m / s.