How high?

Classical Mechanics Level 2

You drop an object from the top of your house and it takes 5 seconds for it to hit the ground. How high are you in meters neglecting air resistance?


The answer is 122.6.

Robert Fritz by Robert Fritz , 20, USA

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9 solutions

Pritipanna Ratha
Mar 4, 2014

S=ut+1/2 at^2

3 Helpful 0 Interesting 0 Brilliant 0 Confused
Adil Amin
Mar 31, 2014

this equation will be used, d=1/2gt^2 Ans: 122.5 m

1 Helpful 0 Interesting 0 Brilliant 0 Confused
Michael Barril
Mar 10, 2014

For basic formula for free falling body is y=1/2 gt^2, where y=distance traveled by the object, g=gravity(981 m/s), t=time in sec, therefore y=1/2(9.81)(5^2) = 122.625 m.

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Robert Fritz
Mar 2, 2014

The distance equation for free fall is D=1/2at^2. a=gravity/acceleration,(9.81m/s^2) t=time in seconds.

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Vignesh .G
Mar 11, 2015

s=ut+(at^2/2); initial time=0; S=at^2/2; S=(9.8*25)/2; S=122.6;

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Teja Nannu
Oct 22, 2014

Height=1/2*(g * t^2).

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Jaivir Singh
Apr 16, 2014

s = 5 * 25

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Ashok Aryan
Mar 31, 2014

s=(1/2)gt^2

0 Helpful 0 Interesting 0 Brilliant 0 Confused
Mar John Quijas
Mar 5, 2014

h=1/2(9.81)(5)^2=123

0 Helpful 0 Interesting 0 Brilliant 0 Confused

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