document.write( "Question 29455: if a ball is thrown directly upward with a velocity of 20 feet per second, its heigh (in feet) after t seconds is given by y= 20t - 16t^2. what is the max height attained by the ball? \n" ); document.write( "

Algebra.Com's Answer #16236 by Paul(988) $\"\"$ $\"About$

You can put this solution on YOUR website!
Differenate the function:\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " $\"dy%2Fdx=20t-16t%5E2\"$
\n" ); document.write( " $\"dy%2Fdx=20-32t\"$
\n" ); document.write( "-32t=-20
\n" ); document.write( "t=0.625\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "lim $\"20t-16t%5E2\"$ = 6.25
\n" ); document.write( "t->0.625\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Hence, the maxium height reached was 6.25ft.
\n" ); document.write( "Paul.
\n" ); document.write( " \n" ); document.write( "

\n" );