document.write( "Question 65679: Find the time required for an object to fall to the ground from a building that is 1400ft high.
\n" ); document.write( "Witht his problem I am lost because there is only one number to use, how can I figure it with only one number? \n" ); document.write( "

Algebra.Com's Answer #46373 by funmath(2933) $\"\"$ $\"About$

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Find the time required for an object to fall to the ground from a building that is 1400ft high.
\n" ); document.write( "displacement, y=1400
\n" ); document.write( "acceleration, a=32 ft/s^2 (This is the acceleration due to gravity)
\n" ); document.write( "initial velocity, v=0 because it is dropped
\n" ); document.write( "There are a couple of equations you can use, here's one:
\n" ); document.write( " $\"highlight%28y=vt%2B%281%2F2%29at%5E2%29\"$
\n" ); document.write( " $\"1400=0t%2B%281%2F2%29%2832%29t%5E2\"$
\n" ); document.write( " $\"1400=0%2B16t%5E2\"$
\n" ); document.write( " $\"1400=16t%5E2\"$
\n" ); document.write( " $\"1400%2F16=16t%5E2%2F16\"$
\n" ); document.write( " $\"1400%2F16=t%5E2\"$
\n" ); document.write( " $\"sqrt%281400%2F16%29=t\"$ Ignore +\- because negative time has no meaning here.
\n" ); document.write( " $\"sqrt%28100%29%2Asqrt%2814%29%2F4=t\"$
\n" ); document.write( " $\"10%2Asqrt%2814%29%2F4=t\"$
\n" ); document.write( " $\"5%2Asqrt%2814%29%2F2=t\"$
\n" ); document.write( "t~~9.35414 s
\n" ); document.write( "If significant figures are important in your class, round off to 2 significant figures:
\n" ); document.write( "t~~9.4 s
\n" ); document.write( "Happy Calculating!!! \n" ); document.write( "

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