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Lo que te dan son:
Ec = 36 J
m = 2 kg
v = ?
Calculamos
Ec = 1/2 m * v²
36 J = 1/2 (2 kg) (v)²
36 J = 1 kg (v)²
(36 J) / (1 kg) = v²
36 m/s = v²
√36 m/s = v
6 m/s = v
v = 6 m/s
Respuesta.
v = 6 m/s