document.write( "Question 1118705: A video tracking device recorded the height h, in metres, of a baseball after it was hit into the air. The data collected can be modelled by the quadratic relation h=-3(t-3)^2+18, where t is the time in seconds after the ball was hit.\r
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\n" ); document.write( "c) At what time(s) was the baseball at the height of 10m?
\n" ); document.write( "d) Approximately when did the baseball hit the ground?\r
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Algebra.Com's Answer #734118 by MathTherapy(10552) $\"\"$ $\"About$

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A video tracking device recorded the height h, in metres, of a baseball after it was hit into the air. The data collected can be modelled by the quadratic relation h=-3(t-3)^2+18, where t is the time in seconds after the ball was hit.\r
\n" ); document.write( "\n" ); document.write( "a) What was the maximum height reached by the baseball?
\n" ); document.write( "b) When did the baseball reach its maximum height?
\n" ); document.write( "c) At what time(s) was the baseball at the height of 10m?
\n" ); document.write( "d) Approximately when did the baseball hit the ground?\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "Thank you
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document.write( "Vertex can be read from the equation as it's in vertex form. 
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document.write( "Vertex: (3, 18)
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document.write( "a) is answered as the y-coordinate of the vertex is 18 m.
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document.write( "b) is also answered as the x-coordinate of the vertex is 3 seconds.
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document.write( "c) The answers to this is about 1.4 seconds and again at 4.6 seconds.
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document.write( "d) Set the equation equal to 0, and solve to get t = 0.55 and t = 5.449489743, or t = 5.45 seconds, approximately
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document.write( "   but the larger t-value, or 5.45 seconds is the time it takes to hit the ground.
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document.write( "IGNORE all other USUAL WRONG answers!! \n" );
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