Object in free fall - Velocity

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Homework Help Overview

The discussion revolves around an object in free fall at the Earth's surface, specifically focusing on determining the initial velocity of the object given its average velocity over a 1.0 second interval.

Discussion Character

  • Exploratory, Assumption checking, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss the use of the average velocity equation and express uncertainty about how to find the initial velocity. Some suggest that additional equations of motion are necessary to solve for the unknowns. There is also a mention of potential issues with the problem's solvability and the implications of having multiple solutions.

Discussion Status

Participants are actively engaging with the problem, questioning the assumptions made and exploring different equations that could be applied. Some guidance has been offered regarding the need for additional equations to resolve the unknowns, and there is a recognition of the complexity involved in the problem.

Contextual Notes

There is a noted concern regarding the problem's formulation, with some participants feeling that it may be insolvable or could lead to infinite solutions without further information.

mybrohshi5
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Homework Statement



An object is in free fall at the surface of the Earth. In a certain 1.0 second time interval, the average velocity of the object is measured to be 2.0 m/s downward.

What was the velocity of the object at the beginning of the 1.0 second interval?


Homework Equations



Vavg = vi + vf / 2

The Attempt at a Solution



I came across this as i am studying for my physics final.

The answer is 2.9 m/s upward.

I am not sure how to get this because i cannot think of the right equation to use to get me to the correct answer.

Any help or hints would be greatly appreciated. Thank you
 
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You have the first equation, with 2 unknowns.
You need another equation of motion to solve for vi and vf.
List what is known and unknown.
Watch your plus and minus signs.
 
mybrohshi5 said:

Homework Statement



An object is in free fall at the surface of the Earth. In a certain 1.0 second time interval, the average velocity of the object is measured to be 2.0 m/s downward.

What was the velocity of the object at the beginning of the 1.0 second interval?


Homework Equations



Vavg = vi + vf / 2

The Attempt at a Solution



I came across this as i am studying for my physics final.

The answer is 2.9 m/s upward.

I am not sure how to get this because i cannot think of the right equation to use to get me to the correct answer.

Any help or hints would be greatly appreciated. Thank you

It seems to me you need a starting point. The problem as stated seems insoluable--or having infinite solutions, if you prefer.
 
PhanthomJay said:
You have the first equation, with 2 unknowns.
You need another equation of motion to solve for vi and vf.
List what is known and unknown.
Watch your plus and minus signs.

Thank you Jay. I think i got it now using the other equation: vf = vi + at
 

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