Gravity on Earth If a rock falls from a height of 100 meters on Earth, the height H (in meters) after t seconds is approximately
H(t) = 100 -4.9 t2
(a) In general, quadratic functions are not one-to-one. However, the function H(t) is one-to-one. Why?
(b) Find the inverse of H and verify your result.
(c) How long will it take a rock to fall 80 meters?
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