Respuesta :

Answer:

t=3.0289s (Assuming a=9.81)

t=3s (Assuming a=10)

Explanation:

a=9.81

u=0

s=45

[tex]s = ut + \frac{1}{2} a{t}^{2} [/tex]

[tex]45 =0 + \frac{1}{2} (9.81) {t}^{2} [/tex]

t = 3.0289s

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