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Los datos son:
vi = 0 m/s
t = 4 s
g = 9,8 m/s²
vf = ?
d = ?
Calculamos la velocidad que alcanza
vf = vi + gt
vf = gt
vf = (9,8 m/s²) (4s)
vf = 39,2 m/s-----------------------Respuesta
Calculamos la altura
d = vi.t + 1/2 gt²
d = 1/2 gt²
d = 1/2 (9,8 m/s²) (4s)²
d = 4,9 m/s² (16s²)
d = 78,4 m-----------------------Respuesta