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Trabajo = Cambio en energía mecánica = Energía cinética final - Energía cinética inicial
= [ 1/ 2] m (Vfinal ^2 - Vinicial^2] = [1/2] [10 kg] [5^2 - 4^2] m^2/s^2 = 5*(25 - 16)
= 45 j
Respuesta: 45 j