You drive 6.0 km at 50 km/h and then another 6.0 km at 90 km/h. Your average speed over the 12 km drive will be
A) greater than 70 km/h.
B) equal to 70 km/h.
C) less than 70 km/h.
D) exactly 38 km/h.
E) It cannot be determined from the information given because we must also know directions traveled.
Question 2
According to Aristotle, which of these is a natural or unforced motion?
A) A book coming to rest as it slides along the floor.
B) A stone falling straight downward.
C) Both of the above.
D) Neither of the above.
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