document.write( "Question 1153459: The height of an object dropped from the top of a 64-foot building is given by h(t)=-16t^2+64. How long will it take the object to hit the ground? \n" ); document.write( "

Algebra.Com's Answer #775684 by ikleyn(52794) $\"\"$ $\"About$

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document.write( "The object will hit the ground when\r\n" );
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document.write( "    -16*t^2 + 64 = 0   (i.e. when h(t) = 0 ).\r\n" );
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document.write( "It is the same as\r\n" );
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document.write( "    16t^2 = 64\r\n" );
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document.write( "    t^2   = 64/16\r\n" );
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document.write( "    t^2   = 4\r\n" );
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document.write( "    t     =  = 2.\r\n" );
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document.write( "ANSWER.  In 2 seconds.\r\n" );
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