document.write( "Question 200254: A student dropped a ball from the top of a 64 foot building. The height of the ball after t seconds is given by the quadratic equation h=-16t^2+64. How long will it take the ball to hit the ground? \n" ); document.write( "

Algebra.Com's Answer #150555 by vleith(2983) $\"\"$ $\"About$

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what is the height of the ball when i hits the ground?
\n" ); document.write( "zero.
\n" ); document.write( "So substitute in 0 and solve for t
\n" ); document.write( " $\"h=-16t%5E2%2B64\"$
\n" ); document.write( " $\"0+=+16t%5E2%2B64\"$
\n" ); document.write( " $\"-64+=+-16t%5E2\"$
\n" ); document.write( " $\"4+=+t%5E2\"$
\n" ); document.write( " $\"2+=+t\"$ \n" ); document.write( "

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