Asked Feb 6, 2020

A person walks up a stalled 20 m long escalator in 80 s. When standing on the same escalator, now moving, the person is up in 57 s. How much time would it take that person to walk up the moving escalator?


Expert Answer

Step 1

When the escalator is stalled, calculate the speed (v1).

Physics homework question answer, step 1, image 1

Step 2

When the escalator moves, calculate the speed (v2).

Physics homework question answer, step 2, image 1

Step 3

Calculate the speed (v) when both the person and escalator moves up.

Physics homework question answer, step 3, image 1


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