Jailon S.

asked • 04/26/16

You drop keys from a window 30 feet above ground.How long will it take for them to land

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1 Expert Answer

By:

Michael J. answered • 04/26/16

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5 (5)

Applying SImple Math to Everyday Life Activities

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Use the formula for free fall.
 
d = di + 0.5gt2
 
where:
di = distance above the ground
g = -32 ft/s2
d = final distance
 
Plugging in these numbers, we get the formula
 
d = 30 - 16t2
 
 
Set d=0 and solve for t.
 
0 = 30 - 16t2
 
 
I let you take it from here.
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