Answered: 58. | A hotel elevator ascends 200 m…

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter3: Motion Along A Straight Line

Section: Chapter Questions

Problem 57P: A powerful motocycle can accelerate from rest to 26.8 m/s (100 km/h) in only 3.90 s. (a) What is its...

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For part b, I do not really understand what the question is asking. During the 200 m trip upwards, to we have to consider that the elevator accelerates for 5 seconds, then decelarates for 5 secs and then moves with constant velocity?

I do get the final answer that is 45 secs, but Ido not conceptually understand how I am supposed to understand that there is a period of decelaration during the upward motion.

Could you please solve only part b and help me understand why both periods of acceleration and deceleration both need to be taken into consideration?

58. || A hotel elevator ascends 200 m with a maximum speed of
5.0 m/s. Its acceleration and deceleration both have a magnitude
of 1.0 m/s?.
a. How far does the elevator move while accelerating to full
speed from rest?
b. How long does it take to make the complete trip from bottom
to top?

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