You need to provide units for the 6.0 speed. I assume the units of the car's mass (1400) are also kg.
Anyway, require that they both have the same M*V product. Then solve for the velocity of the bike & rider
At what speed do a bicycle and its rider, with a combined mass of 100 kg, have the same momentum as a 1400 car traveling at 6.0 ?
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