Concept explainers
To find the speed going up.
Answer to Problem 20P
The average speed of going top be
Explanation of Solution
Formula:
Given that an elevator went from the bottom to the top of a 240m tower, remained there for 12s, and returned to the bottom in an elapsed time of 2 min. If the elevator traveled 1 m/s faster on the way down.
Formula:
Let speed be
First, determine the total time of 240m distance covered with speed
Now, determine the total time of 240m distance covered with speed
Finally total time be the time to go up and go down with stay (no motion)
Elevator time is not moving for 12 s
So, the total time be
Now, Add equation ( i ) and equation ( ii ) and compare with equation (iii)
Hence, The speed of the going top be
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