A student drove to the university from her home and noted that the odometer on her car increased by 12.0 km. The trip took 20.0 min.(a) What was her average speed? (b) If the straight-line distance from her home to the university is 10.3 km in a direction 25.0° south of east, what was her average velocity?(c) If she returned home by the same path 7 h 30 min after she left, what were her average speed and velocity for the entire trip?average speed km/h average velocity  km/h

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Asked May 20, 2019
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A student drove to the university from her home and noted that the odometer on her car increased by 12.0 km. The trip took 20.0 min.(

a) What was her average speed? 

(b) If the straight-line distance from her home to the university is 10.3 km in a direction 25.0° south of east, what was her average velocity?

(c) If she returned home by the same path 7 h 30 min after she left, what were her average speed and velocity for the entire trip?

average speed
 km/h 

average velocity 
 km/h

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Expert Answer

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Step 1

(a) The average speed of an object is the total distance traveled by the object divided by the elapsed time to cover that distance.

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Step 2

(b) Since time is not mentioned in this case, consider time taken as 20.0 min. The average velocity of an object is the displacement traveled by the time elapsed. It is a vector quantity.

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Step 3

(c) The average speed is related to the distance whereas the average velocity related to the displacement. Displacement is the diff...

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