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Jean Jules
Answers (2)
initially at rest means the initial velocity is zero.
a) h(t) = -4.9t^2 + 1600 The rock hits the bottom of the canyon when the height is zero. b) 0 = -4.9t^2 + 1600 ; 4.9t^2 = 1600 ; t^2 = 1600/4.9 = 326.53 t = square roots of 326.53 = 18.07 seconds
