Calculating Displacement of a Diver in Free Fall

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Homework Help Overview

The discussion revolves around calculating the displacement of a diver in free fall during the last 1.10 seconds of her dive, given her final velocity just before impact with the water.

Discussion Character

  • Exploratory, Mathematical reasoning, Assumption checking

Approaches and Questions Raised

  • Participants explore the use of kinematic equations to find displacement, questioning the initial velocity and the setup of the problem. Some suggest breaking the problem into segments to find displacements for different time intervals.

Discussion Status

Several participants are actively engaging with the problem, attempting different calculations and questioning each other's methods. There is a focus on identifying potential errors in the calculations and clarifying the initial conditions.

Contextual Notes

There is uncertainty regarding the initial velocity used and the interpretation of the time intervals involved in the calculations. Participants are also addressing the implications of negative values in their equations.

pookisantoki
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The velocity of a diver just before hitting the water is -10.2m/s, where the minus sign indicated that her motion is directly downward. What is her displacement during the last 1.10sec of the dive?

I tried to use dthe x=1/2(Vinitial + Vfinal)t=40.8 but it's wrong, what am i doing wrong??
 
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Is that the full question? Whats the Vinitial you used?
 
Initial velocity, final velocity and g is known. From these you can find displacement d1 and time t.
Then find the displacement d2 for time (t - 1.10 s).
(d1 - d2) will be the required answer.
 
I tried to solve this the way you wrote but I must have messed up along the way because, my answer isn't matching up
So i setted up where t=-10.2/-9.8
t=1.0408

y1=1/2(-10.2)*1.0408
y1=5.30808m

t2=1.0408-1.10
t2=-.0592

y2=1/2*-10.2*.0592
Y2=.30192

Displacement=5.30808-.30192=5.00616

Please let me know what I am doing wrong. Thank you
 

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