Homework Statement
A kangaroo jumps a height of 2.8m. How long was it in the air?
Homework Equations
v=v0+at
x=x0+v0t+(1/2)at^2
v^2=v0^2+2aΔx
The Attempt at a Solution
-2.8 = -4.9t^2
.57 = t^2
t = .76 s (down)
0 = v0^2+2(9.8)(2.8)
54.88 = v0^2
v0 = 7.408
0 = 7.408-9.8t
t = .76 (up)
t...