Free Falling Bodies: Calculating Time for Wrecking Ball

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Homework Help Overview

The discussion revolves around a physics problem involving a wrecking ball that falls after its cable breaks. The original poster seeks to determine the total time it takes for the ball to fall to the ground, given that it takes 1.31 seconds to fall halfway.

Discussion Character

  • Exploratory, Mathematical reasoning, Assumption checking

Approaches and Questions Raised

  • Participants discuss various formulas related to motion under gravity, including kinematic equations. There is uncertainty about the appropriate values for initial and final positions, as well as the initial velocity of the wrecking ball.

Discussion Status

Participants are actively engaging with the problem, exploring different equations and questioning the assumptions regarding initial conditions. Some guidance has been offered regarding the use of specific formulas, but no consensus has been reached on how to proceed with the calculations.

Contextual Notes

There is a lack of clarity regarding the initial velocity of the wrecking ball and the specific values for positions in the kinematic equations being discussed. The original poster has indicated confusion about these aspects, which may affect the problem-solving process.

pookisantoki
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Homework Statement


A wrecking ball is hanging at rest from a crane when suddenly the cable breaks. The time it takes for the ball to fall halfway to the ground is 1.31sex. Find the time it takes for the ball to fall from rest all the way to the ground.

I think the formula to use is t=vfinal-vinitial / g
But not sure what vfinal is to use this formula so I am stuck...
 
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Hey dude try using this formula: X=X+vt+0.5at^2 :biggrin:
 
with that formula
a=-9.8
t=1.31sec
where would the X come from??
 
Xfinal=Xinitial + vt + 0.5at^2. i believe you know Xinitial?
 
I believe the x initial is 0 and xfinal is .5 since it's half way but not sure how I would find "v" from the question so that I can find "t"
 
the v is vinitial so what should the initial velocity of something that is at rest be?
 

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