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F * S = m * v2 / 2
F = m * V2 / 2 /S = 2 kg * 9 m2/s2 /2 /8 m = 1,125 N
Fc = 1,125 + T = 1,125 N + 2 N = 3,125 N
W = Fc * S = 3,125 N * 8 m = 25 J