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# Some simple physics

Started by Ploper, Nov 01 2007 11:39 PM

4 replies to this topic

### #1

Posted 01 November 2007 - 11:39 PM

So lets say Will jumps from an airplane that is at X hight. It took him Y minutes to reach the ground.

Is it safe to assume that if he jumps from 2X hight, that it will take him 2Y minutes to touch ground?

How about 5X and 5Y?

Or 100X and 100Y?

Is it safe to assume that if he jumps from 2X hight, that it will take him 2Y minutes to touch ground?

How about 5X and 5Y?

Or 100X and 100Y?

### #2

Posted 01 November 2007 - 11:53 PM

No.So lets say Will jumps from an airplane that is at X hight. It took him Y minutes to reach the ground.

Is it safe to assume that if he jumps from 2X hight, that it will take him 2Y minutes to touch ground?

How about 5X and 5Y?

Or 100X and 100Y?

And I hope he brought a parachute.

Spoiler for solution

*The greatest challenge to any thinker is stating the problem in a way that will allow a solution.*

- Bertrand Russell

### #3

Posted 01 November 2007 - 11:57 PM

you have the right answer with good reasoning.

But actually, I was lookin' for the part with wind resistance.

At a greater hight, Will will spend more time in terminal velocity,

raising his speed average.

But yeah, I understand what you mean

But actually, I was lookin' for the part with wind resistance.

At a greater hight, Will will spend more time in terminal velocity,

raising his speed average.

But yeah, I understand what you mean

### #4

Posted 02 November 2007 - 02:40 PM

Well, it depends on how big is X.

Spoiler for solution

Spoiler for solution

### #5

Posted 02 November 2007 - 09:42 PM

Is it safe to assume that if he jumps from 2X hight, that it will take him 2Y minutes to touch ground?

Spoiler for solution

Two caveats:
Spoiler for solution

*The greatest challenge to any thinker is stating the problem in a way that will allow a solution.*

- Bertrand Russell

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