What is the acceleration of the body’s motion if its speed has decreased from 50m / s to 30m / s in 20s.

Initial data: t (time during which the speed of the body changed) = 20 s, V0 (initial speed of the body) = 50 m / s, V (final speed of the body) = 30 m / s.

We find the acceleration of the body from the following formula:

V = V0 + a * t and a = (V – V0) / t.

Let’s do the calculation:

a = (30 – 50) / 20 = -1 m / s2 (since a <0, then the movement of the body is equally slow).

Answer: The module of acceleration of the body is 1 m / s2.