- #1
Beeorz
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Homework Statement
A stone is tossed vertically upward with an initial velocity of 23 ft/s from the top of a 15 ft building.
(a) What is the height of the stone after 0.12 s?
(b) Find the velocity of the stone after 3 s.
(c) When does the stone hit the ground?
Homework Equations
s(t) = s0 + v0t - (1/2)g*t^2
v(t) = v0 - g*t
The Attempt at a Solution
(a) s(t) = 15 + (23)(0.12) - (1/2)(32)(0.12^2) = 17.5296
(b) v(t) = 23 - 32(3) = -73
(c) 0 = 15 + 23t - (1/2)(32)t^2
0 = 16t^2 - 23t -15
Parts (a) and (b) are correct. I am only have problems with part (c). Whenever I solve this my answer comes up incorrect. Either my math is wrong is I'm simply not working it correctly. Any help is appreciated.