How to Calculate Velocity and Time of a Rock Tossed Into a Hole?

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Homework Help Overview

The discussion revolves around a physics problem involving the motion of a rock tossed vertically into a hole. The original poster seeks assistance in calculating the rock's velocity upon impact with the bottom of a 10-meter deep hole and the total time the rock is in the air.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the equations relevant to the object's trajectory and question the necessity of the acceleration due to gravity in the calculations. There is an inquiry about how to approach the time of flight calculation.

Discussion Status

Some participants have provided guidance on considering the gravitational acceleration and have referenced a tutorial that may contain relevant information. Multiple interpretations of the problem are being explored, particularly regarding the necessary equations and parameters.

Contextual Notes

The original poster expresses uncertainty about how to calculate the time the rock is in the air, indicating a potential gap in understanding the concepts involved. There is also a mention of a specific numerical value for velocity that may require further verification.

punkytrixter
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Hello, if someone could help me with the second part of this problem, I would be so grateful.

A rock is tossed straight up with a velocity of + 20 m/s When it returns, it falls into a hole 10 m deep.

What is the rock's velocity as it hits the bottom of the hole?
I got -24.4 m/s for this.

How long is the rock in the air, from the instant it is released until it hits the bottom of the hole?
This is what I have no idea how to figure out.

Any help you can give me would be much appreciated. :biggrin:
 
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Well what equations do you use to describe the object's trajectory as a function of time ?

marlon
 
Dont you need the a (or g) value to work this out as the object falls freely on the descend?
 
The acceleration is indeed the g-vector.



marlon

ps : check out this TUTORIAL

The answer you are looking for is right in there
 

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