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Vo. = 40m/s
g = 10 m/s^2
Vf = 0m/s
a)
h maxima = vo.^2 / 2g
h maxima = (40m/s)^2 / 2(10m/s^2)
h maxima = 1600/ 20m/s^2
h maxima = 80 metros
b)
t = vf - vo / g
t = 0 - 40 / 10
t = 4 s
c) h = ( vf - vo ) / 2 * t
h = 0 - 40/ 2 * 2
h = 40 /2 *2
h = 20 * 2
h = 40 m
d) vf = vo + g.t
vf = 40m/s + (10m/s^2)(2s)
vf = 40m/s + 20m/s
vf = 60m/s
e) h = ( vf - vo ) / 2 * t
h = ( 0 - 40)/2 * 6
h = 40/2 *6
h = 20 * 6
h = 120m
f) vf = vo + g.t
vf = 40m/s + (10m/s^2)(6s)
vf = 40m/s + 60m/s
vf = 100m/s