document.write( "Question 1146380: A model rocket is blasted off from the ground into the air and fall back to the ground. Its height, h, in meters is approximated by the function h (t) = -4.9t ^2 + 15t +2, where t is the time in seconds.\r
\n" ); document.write( "\n" ); document.write( "From what height is the rocket blasted off?
\n" ); document.write( "When is the rocket on the ground?
\n" ); document.write( "When does the rocket reach its max height, and what is the max height? \n" ); document.write( "
Algebra.Com's Answer #767643 by Alan3354(69443)\"\" \"About 
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A model rocket is blasted off from the ground into the air and fall back to the ground. Its height, h, in meters is approximated by the function h (t) = -4.9t ^2 + 15t +2, where t is the time in seconds.\r
\n" ); document.write( "\n" ); document.write( "From what height is the rocket blasted off?
\n" ); document.write( "h(t) = -4.9t^2 + 15t + 2
\n" ); document.write( "It's h(0). Sub 0 for t.
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\n" ); document.write( "When is the rocket on the ground?
\n" ); document.write( "When it's launched, and at impact.
\n" ); document.write( "IOW, when h(t) = 0
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\n" ); document.write( "When does the rocket reach its max height, and what is the max height?
\n" ); document.write( "t for max height is the vertex of the parabola, at
\n" ); document.write( "t = -b/2a
\n" ); document.write( "Find t, then find h(t)
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