The body was thrown vertically upward with an initial speed of 20 m / s.

The body was thrown vertically upward with an initial speed of 20 m / s. What is the modulus of its speed in about, 5 s after the start of movement? Do not take into account the air resistance.

Given:

u0 = 20 meters / second – initial speed of the body;

t = 0.5 seconds – time interval;

g = 10 m / s2 – acceleration of gravity.

It is required to determine u1 (meter / second) – the speed of the body after a time interval equal to t.

Since, according to the condition of the problem, the air resistance is not taken into account in the solution, to determine the speed of the body, it is necessary to use the following formula:

u1 = u – g * t;

u1 = 20 – 10 * 0.5;

u1 = 20 – 5 = 15 meters / second.

Answer: In 0.5 seconds, the body speed will be 15 meters / second.