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Calculating Time in gravity/acceleration problemby jquiring
Tags: time 
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#1
Apr908, 01:20 PM

P: 1

I understand that gravity acts upon objects at a fairly steady rate on earth. How could I calculate the time in the following example:
An object falls ten centimeters before hitting the ground. How much time has passed from when it fell to when it hit the ground? I can't use a stopwatch because the distances are so small. Since gravity is a constant (9.8 m/s2), how can I calculate the time over such a short distance? I'm sure that a computer could calculate this almost instantly, but I would like to know how to perform the calculation on paper. 


#2
Apr908, 03:52 PM

Sci Advisor
P: 6,027

The general form for your problem is d=vt+gt^{2}/2, where v is the initial speed and d is the distance. Air resistance is neglected. Assuming you simply drop it, you will get t=(0.2/9.8 )^{1/2} sec.



#3
Feb1910, 06:24 PM

P: 77




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