1-D Kinematics Calculating Average Speed and Average Velocity The average speed of an object is the rate at which an object covers distance. The average velocity of an object is the rate at which an object changes its position. Thus, Ave. Speed = distance Ave. Velocity = displacement time time Speed, being a scalar, is dependent upon the scalar quantity distance. Velocity, being a vector, is dependent upon the vector quantity displacement. 7. You run from your house to a friend's house that is 3 miles away in 30 minutes. You then immediately walk home, taking 1 hour on your return trip Your House Friend's House West East iiii 3 miles a. What was the average speed (in mi/ hr) for the entire trip? b. What was the average velocity (in mi/hr) for the entire trip? 8. A cross-country skier moves from location A to location B to location C to location D. Each leg of the back-and-forth motion takes 1 minute to complete; the total time is 3 minutes. The unit of length is meters. C West East D B 1=0mm t=2min t=3min t=1 min 20 100 120 10 160 Calculate the average speed (in m / min) and the average velocity (in m / min) of the skier during the three minutes of recreation. PSYW