After traveling for 3.0 seconds, a dog reaches a speed of 15 m/s. what is the dog's acceleration?

Acceleration is the rate of change of speed or velocity. This being said, we can calculate for the acceleration by dividing the given speed by the given time. That is,

a = speed / time

Substituting the known value,

a = 15 m/s / 3s

a = 5 m/s²

Hence, the answer is 5 m/s².