Posted by gagan on Friday, January 23, 2009 at 9:21am.
a) just sub t=1 into the function
b) set -4.9t^2 + 27t + 2.4 = 30
and solve. You should get two solution for t
The balloon will be above 30 m for all values of t between those two solutions
c) find the vertex, the max height is the h coordinate of the vertex
Use this method:
for y = ax^2 + bx + c, the x of the vertex is -b/(2a)
once you have that value, sub it back in to get the y.
(of course you are dealing with t instead of x, and h instead of y)
d) set —4.9t^2 + 27t + 2.4 = 0 and solve for t
One of the values of t will be negative, that would be an extraneous root.
thnx a lot now i fully understand
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