document.write( "Question 245930: I'm not sure how to do this problem...\r
\n" ); document.write( "\n" ); document.write( "In a physics experiment, a ball is dropped off a 144-ft platform. The height of the ball above the ground is given by the equation h=-16t^2+144\r
\n" ); document.write( "\n" ); document.write( "where h is the ball's height in feet, and t is the time in seconds after the ball is dropped (t is > or = 0)\r
\n" ); document.write( "\n" ); document.write( "Find the time required for the ball to hit the ground.(Let h =0) \n" ); document.write( "
Algebra.Com's Answer #179599 by ankor@dixie-net.com(22740)\"\" \"About 
You can put this solution on YOUR website!
In a physics experiment, a ball is dropped off a 144-ft platform. The height of the ball above the ground is given by the equation h=-16t^2+144
\n" ); document.write( "where h is the ball's height in feet, and t is the time in seconds after the ball is dropped (t is > or = 0)
\n" ); document.write( "Find the time required for the ball to hit the ground.(Let h =0)
\n" ); document.write( ":
\n" ); document.write( "-16t^2 + 144 = 0
\n" ); document.write( "simplify and change the signs, divide by -16
\n" ); document.write( "t^2 - 9 = 0
\n" ); document.write( "t^2 = 9
\n" ); document.write( "t = \"sqrt%289%29\"
\n" ); document.write( "t = 3 sec to hit the ground
\n" ); document.write( ":
\n" ); document.write( ":
\n" ); document.write( "Check this
\n" ); document.write( "-16(3^2) + 144 =
\n" ); document.write( "-16(9) + 144 =
\n" ); document.write( "-144 + 144 = 0
\n" ); document.write( " \n" ); document.write( "
\n" );