a) "Julie drives 50 miles at an average speed of 50 miles/hr followed by a distance of 50 miles at 60 miles/hr. What is their average speed over the 100 mile trip? Describe how Julie travels the first 50 miles of her journey."

b) "A racehorse coming out of the gate accelerates from rest to a velocity of 11m/s due west in 1.9 seconds. What is its average acceleration? Assume that east is positive."