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v(i) = v - gt
Sustituimos arriba:
y = s(i) + vt - gt^2 +1/2 g t^2
y = s(i) + vt -1/2 g t^2
s(i) = 0. v=0
En tiro vertical:
y = -1/2 gt^2
t= (v-v(i))/ g
t = -40 / -10 = 4s
y = -1/2 × -10 × 4^2
y = 80m