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W = F x dcos30
W = 70N x 6mcos30
W = 364N
Aplicamos el teorema de trabajo y energía cinética
W = 1/2mVf^2 - 1/2mVo^2
W = 1/2mVf^2 - 0
364N = 1/2mVf^2
364N x 2 = mVf^2
[364N x 2] / 10kg = Vf^2
Vf = 8.5 m/s