A girl drove to a hospital from her home and noted the odometer reading of her car increased by 12 km. The trip took 18 minutes. (i) What was her average speed? (ii) If she returned home by the same path 7h30min after she left, what was her average speed and velocity for the entire trip?
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Explanation:
Answer :
In this question a girl was driving a car from her home to the hospital
so the given data is
Distance = 12 km
time = 18 min = 18/60 hr
speed = distance/time
v = 12×60/18
= 2×60/3
= 40 km/hr
now the average speed of the car was 40 km/ hr
in the second part we are asked that what would happen if she returned 7:30 min after she left .
so here the average speed will remain same because car is the same .
But the velocity will be changed
velocity is = Total displacement /
time
velocity = 0/15 min
velocity = 0
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