In 3 seconds, the body’s speed changed from 15 m / s to 6 m / s. Find acceleration.

The acceleration of a body is a value that characterizes the change in the speed of a body’s movement with time, it is expressed in meters per second squared, m / s².

The formula for calculating the acceleration at uniformly accelerated motion: a = (v2 – v1) / t, where v1 is the speed at the starting point of the trajectory, v2 is the speed at the end point of the trajectory, t is the time interval when the speed of movement was changed.

Thus, a = (6 – 15) / 3 = -3 m / s², i.e. the movement was equally slow.

Answer: a = -3 m / s².