document.write( "Question 509301: If a ball is hit upward at 80 ft per second, then its approximate height, in meters, t seconds later is given by h(t) = 80t − 16t2. When does the ball hit the ground? \n" ); document.write( "

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If a ball is hit upward at 80 ft per second, then its approximate height, in meters, t seconds later is given by h(t) = 80t − 16t2. When does the ball hit the ground?
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\n" ); document.write( "That's the height in feet, not meters.
\n" ); document.write( "It hits the ground when h = 0
\n" ); document.write( "h(t) = 80t - 16t^2 = 0
\n" ); document.write( "80 = 16t
\n" ); document.write( "t = 5 seconds
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\n" ); document.write( "h(t) = 0 at t = 0 also, when the ball is \"launched\"
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