document.write( "Question 970547: If a model rocket is launched from the ground with an initial velocity of 288 feet per second. How long will it take to reach maximum height? \r
\n" ); document.write( "\n" ); document.write( "Assume the parachute didn't open. How long would it take the rocket to return to earth?
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Algebra.Com's Answer #593164 by josmiceli(19441)\"\" \"About 
You can put this solution on YOUR website!
I think the equation is:
\n" ); document.write( "\"+h%28t%29+=+-16t%5E2+%2B+288t+\"
\n" ); document.write( "The \"+t+\" coordinate of the maximum height
\n" ); document.write( "is at \"+t%5Bmax%5D+=+-b+%2F+%282a%29+\"
\n" ); document.write( "\"+a+=+-16+\"
\n" ); document.write( "\"+b+=+288+\"
\n" ); document.write( "\"+t%5Bmax%5D+=+-288+%2F+%282%2A%28-16%29%29+\"
\n" ); document.write( "\"+t%5Bmax%5D+=+288%2F32+\"
\n" ); document.write( "\"+t%5Bmax%5D+=+9+\" sec
\n" ); document.write( "It will take 9 sec to reach maximum height
\n" ); document.write( "--------------------
\n" ); document.write( "When the rocket returns to earth, \"+h+=+0+\"
\n" ); document.write( "\"+0+=+-16t%5E2+%2B+288t+\"
\n" ); document.write( "\"+0+=+16t%2A%28+-t+%2B+18+%29+\"
\n" ); document.write( "\"+t+=+0+\" ( the launch time )
\n" ); document.write( "\"+t+=+18+\" ( return to earth )
\n" ); document.write( "In 18 sec the rocket returns to earth
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\n" ); document.write( "here's the plot:
\n" ); document.write( "\"+graph%28+400%2C+400%2C+-3%2C+24%2C+-150%2C+1500%2C+-16x%5E2+%2B+288x+%29+\"
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