Acceleration: The acceleration is the rate that an object is changing its velocity. Therefore, it is a vector quantity and mathematically is defined as follows: Av Vf - Vi a: At tf - ti Problem 5: You are jogging with a velocity of 2 meters/second to the west, when you feel thirsty and stops to drink water after 5 seconds. First find your velocity the moment you stopped running. Then, find your acceleration during that motion. What are the units for acceleration? What is the direction of acceleration in this motion? Show your work. vi = 2 m/s to Vf = ? the west t; = 0 sec to = 5 sec