A car travels 30 km east and then 40 km north or a

6. A car travels 30 km east and then 40 km north, or a total distance of 70 km in a time of one hour.
A. What is the average speed?
A. 40 kph B. 50 kph C. 60 kph D. 70 kph
B. What is the average velocity?
7. A car moving at 30 m/s slows uniformly to speed of 10 m/s in a time of 5.0 s. Determine the distance it
moves in the third second.
REE – Apr. 2007
8. A student determine to test the law of gravity for himself walks off a skyscraper 900 ft high, stopwatch
in hand and starts his free fall (zero initial velocity). Five seconds later, Superman arrives at the scene
and dives off the roof to save the student. What must Superman’s initial velocity be in order that he
catch the student just before the ground is reached? (Assume that Superman’s acceleration is that of
any free falling body).