document.write( "Question 1176636: A golfer attempts to hit a golfball from a platform above the ground. The function that models the height of the ball is: y= -5t^2-40t+100 where y represents the height, in meters, above the ground at the time, t seconds after contact. There are power lines 185m above the ground. Will the golfball hit the power lines? Be clear and concise in your explanation with reference to you worked solution.
\n" ); document.write( " \n" ); document.write( "

Algebra.Com's Answer #803825 by ankor@dixie-net.com(22740) $\"\"$ $\"About$

You can put this solution on YOUR website!
There has to be an upward velocity of 40 m/s therefore it is +40t
\n" ); document.write( ":
\n" ); document.write( "A golfer attempts to hit a golf ball from a platform above the ground.
\n" ); document.write( "The function that models the height of the ball is: y= -5t^2+40t+100 where y represents the height, in meters, above the ground at the time, t seconds after contact.
\n" ); document.write( " There are power lines 185m above the ground.
\n" ); document.write( " Will the golf ball hit the power lines?
\n" ); document.write( " Be clear and concise in your explanation with reference to your worked solution.
\n" ); document.write( ":
\n" ); document.write( "Will the golf ball reach 185m is the question
\n" ); document.write( "-5t^2 + 40t + 100 = 185
\n" ); document.write( "-5t^2 + 40t + 100 - 185 = 0
\n" ); document.write( "-5t^2 + 40t - 85 = 0
\n" ); document.write( "using the quadratic formula a=-5, b=40, c=-85
\n" ); document.write( "we got \"no real roots\" so it won't quite reach 185 meters
\n" ); document.write( "Graphically, power line is green
\n" ); document.write( " $\"+graph%28+300%2C+200%2C+-6%2C+12%2C+-50%2C+200%2C+-5x%5E2%2B40x%2B100%2C+185%29+\"$ \n" ); document.write( "

\n" );