document.write( "Question 969187: A model rocket is launched from a platform and its height h metres is given as a function of the elapsed time t seconds by h=-4.9t*2+180t+2. Determine the following:
\n" ); document.write( "a)The maximum height of the rocket
\n" ); document.write( "b)The time required for the rocket to reach its maximum height
\n" ); document.write( "c)The time required for the rocket to reach the ground\r
\n" ); document.write( "\n" ); document.write( "Thanks! \n" ); document.write( "
Algebra.Com's Answer #592166 by Alan3354(69443)\"\" \"About 
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h=-4.9t^2 + 180t + 2.
\n" ); document.write( "Determine the following:\r
\n" ); document.write( "\n" ); document.write( "b)The time required for the rocket to reach its maximum height
\n" ); document.write( "max ht is the vertex, at t = -b/2a
\n" ); document.write( "t = -180/9.8 =~ 18.367 seconds
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\n" ); document.write( "\n" ); document.write( "a)The maximum height of the rocket
\n" ); document.write( "Sub 18.367 for t
\n" ); document.write( "Max ht = -4.9*18.367^2 + 180*18.367 + 2
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\n" ); document.write( "c)The time required for the rocket to reach the ground
\n" ); document.write( "-4.9t^2 + 180t + 2 = 0
\n" ); document.write( "Solve for t.
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