If a rock falls from a height of 20 meters on Earth, the height H (in meters)
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If a rock falls from a height of 20 meters on Earth, the height H (in meters) after x seconds is approximately
H(x) = 20 – 4.9x2
(a) What is the height of the rock when x = 1 second?
x = 1.1 seconds? x = 1.2 seconds? x = 1.3 seconds?
(b) When is the height of the rock 15 meters? When is it 10 meters? When is it 5 meters?
(c) When does the rock strike the ground?
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