0=83.3-4.9t^2

a rock falls from a tower that is 83.3 m high. as it is falling, it's height is given by the formula h = 83.3-4.9t^2. how many seconds will it take for the rock to hit the ground (h=0).
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1 Answer

83.3-4.9t^2 = 0

83.3 = 4.9t^2

t^2 = 83.3/4.9

t^2 = 17

t = sqrt(17)

Answer:  sqrt(17) seconds.
by Level 13 User (103k points)

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