Use the following figure for the next problem.
-An object leaves point A and travels in a straight line to point B via path b.In region I,the speed is 100 m/s while in region II,the speed is 71 m/s.How long does it take for the object to go from A to B?
A)82.0 ms
B)70.8 ms
C)61.3 ms
D)34.3 ms
E)27.7 ms

Question

Use the following figure for the next problem. 
-An object leaves point A and travels in a straight line to point B via path b.In region I,the speed is 100 m/s while in region II,the speed is 71 m/s.How long does it take for the object to go from A to B?
A)82.0 ms 
B)70.8 ms 
C)61.3 ms 
D)34.3 ms 
E)27.7 ms

Quizplus · Accepted Answer

The time taken is calculated by dividing the total distance by the average speed. The average speed is the harmonic mean of the speeds in the two regions, which results in approximately 61.3 ms.

Use the Following Figure for the Next Problem