a boy weighing 30 kg is riding a bicycle weighing 50 kg . if the bicycle is moving at a speed of 9 km/h towards the west , find the linear momentum of the bicycle-boy system in SI units "

Momentum of the system = Total mass of the system ×speed= (mass of the cycle+mass of the boy)×speednowspeed = 9 km/h = 9×518 = 2.5 m/smomentum = (50+30)×2.5 = 200 kg m/s

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