6. A girl drove to a hospital from her home and noted the odometer reading of her car
increased by 12km. The trip took 18 min. What was heraverage speed?
If she returned home by same path 7 hr 30min after she left, what was her average
speed and velocity for the entire trip?
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Answer:
a) distance travelled by the girl = 12 km
time taken = 18 minutes
18 minutes = 18/60 hours = 0.3 hours
average speed =
b)
If she returned home by the same path 7 h 30 min after she left,
total time taken = 7hour and 30 min = 7.5h
total distance travelled = 12+12 = 24 km
average speed =
total displacement = 0 (as starting point and end points are same)
average velocity = total displacement/time = 0
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