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

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To calculate the velocity of a rock tossed into a hole, the initial upward velocity is +20 m/s, and upon returning, it hits the bottom of a 10 m deep hole with a velocity of -24.4 m/s. The discussion highlights the need to use kinematic equations to determine the time the rock is in the air. The acceleration due to gravity (g) is essential for these calculations, as it affects the rock's descent. A tutorial is suggested for further guidance on the equations needed to solve the problem.
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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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