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F t = m (V - Vo); si se detiene es V = 0
72 km/h = 20 m/s
F = - 1000 kg . 20 m/s / 50 s = - 400 N
46. Ídem.
t = m V / F = 10 kg . 20 m/s / 120 N = 1,67 s
Saludos Herminio