Respostas

2013-09-28T16:54:52-03:00
Ec = m * V²/2

72 = 1 * V² / 2

144 = V²

V = 12 m/s


Q = m * v
Q = 1 * 12
Q = 12kg*m/s

I = Q

I = F*/\t
12 = 2,4 * /\t

12/2,4 = /\t

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/\t = 5 segundos
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