Question

15. An object is traveling 15 m/s and slows down to 10 m/s in 5 seconds. What is the acceleration rate? (1 point) -1 m/s O 1 m/s/s -5 m/s/s -1 m/s/s

Answer 1

Recall that acceleration is defined as the change in velocity (from initial velocity vi to final velocity vf) over time (it is a rate) so in our case is going from 15 m/s to 10 m/s in a total ot 5 seconds.

Our acceleration then becomes:

a = (vf - vi) / t = (10 - 15) / 5 = -5 / 5 = -1 m/s^2

Notice the acceleration is negative ( the object is reducing its vekocity) and also the units are in meters per second SQUARED.