document.write( "Question 1150599: A model rocket is launched with an initial upward velocity of 65 m/s The rocket's height h (in meters) after t seconds is given by the following. h= 65t -5t^2. Find all values of t for which the rocket's height is 30 meters.Round your answer(s) to the nearest hundredth.
\n" ); document.write( " \n" ); document.write( "

Algebra.Com's Answer #771981 by ikleyn(52779) $\"\"$ $\"About$

You can put this solution on YOUR website!
.
\n" ); document.write( "

\r\n" );
document.write( "\r\n" );
document.write( "    h(t) = 30 meters,   or\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "    -5t^2 + 65t = 30\r\n" );
document.write( "\r\n" );
document.write( "     5t^2 - 65t + 30 = 0\r\n" );
document.write( "\r\n" );
document.write( "      t^2 - 13t + 6  = 0\r\n" );
document.write( "\r\n" );
document.write( "       =  = .\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "There are two roots   =  = 0.479 seconds (approximately, ascending),   and\r\n" );
document.write( "\r\n" );
document.write( "                      =  = 12.521 seconds (approximately, descending).      ANSWER\r\n" );
document.write( "

\r
\n" ); document.write( "\n" ); document.write( "Solved.\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

\n" );