The modern Routemaster bus in London has a mass of 12.65 tonnes.
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Momentum is a function of velocity and mass, therefore, assuming a "large" bus has more mass than a "small" car the bus would have more momentum since the velocities are the same.
Large mass
"large density" ===> (relatively large mass) fits into (relatively small volume)
Usually small metals (e.g magnesium etc) have small capacit but large mass Hope it helps :)
Kilogram or ton.