Question

boy weighting 30 kg is riding a bicycle weighting 50 kilograms if the bycycle is moving at a speed of 90 kilometres per hour towards the west find the linear momentum of the bycycle boy system in s i units
bobpursley
Momentum=total mass*velocity change km/hr to m/s

90km/hr*(1hr/3600s)*1000m/1km= 90/3.6 m/s

check my thinking
200 kgm/s

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