Object in free fall - Velocity

AI Thread Summary
An object in free fall has an average velocity of 2.0 m/s downward over a 1.0 second interval. To determine the initial velocity (vi), both initial and final velocities (vf) are needed, requiring another equation of motion. The discussion highlights the importance of correctly applying the equations and managing signs in calculations. After some guidance, the user concludes that the initial velocity is 2.9 m/s upward. Understanding the relationship between average velocity and acceleration is crucial for solving such problems.
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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