Sorry the diagram is horrible. I tried my best :) This is the measurement of the

Question

Sorry the diagram is horrible. I tried my best :) This is the measurement of the apparent weight of a studentwhile riding an elevator in the ENG building. Which of thefollowing statement describes the direction and type of motion theelevator at region H? a. its moving upward and speeding up b. its moving upward and slowing down c. its moving downward and speeding up d, its moving downward and slowing down e. its moving at constant velocity. I chose A for my answer, but apparently it is D. and Im reallyconfused as to why. Wont they still cause the same change?!?!and I thought when acceleration in the Y direction is greater thenzero (positive) the elevator is moving up and speeding up.. makingyou seem heavier..

Explanation / Answer

This is true, however when you have an initial velocity downwardand the elevator has a positive acceleration (because theaccleration is pointed upwards) f=ma a and m are positive so f mustbe a positive spike. If you were moving upwards and speeding up, you would have to reacha constant velocity to come back down to the students normalweight. So if it levels off at a constant velocity, then yes A is correct,but if the elevator is slowing down then we know it will stop andthe student will come back to their apparent weight. That's probably the only reason they picked d over a. I hopethis helps.

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