- #1
totomyl
- 15
- 1
Homework Statement
A ball is thrown 2.8m/s vertically upward from a window that is 3.6m above the ground. calculate the amount of time the ball spends in the air.
Homework Equations
quadratic equation
d = Vi(t) + 1/2(a)(t)2
The Attempt at a Solution
d = Vi(t) + 1/2(a)(t)2
3.6m =2.8 m/s[up](t) + 1/2(-9.8m/s2[up])(t)^2
0 = -4.9m/s2[up](t)2 + 2.8m/s[up](t) - 3.6m
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into the quadratic formula:
t = [-(2.8) +- sqrt(2.82 - 4(-4.9)(-3.6))] / 2(-4.9)
i end up with a negative under the root sign?