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a 50-g ball rolls across a table at 2 m/s. A 100-g rolls across the same table at 1 m/s. Which ball has more momentum?

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Momentum is the product of the mass and velocity of an object. It refers to the quantity of motion that an object has. 

A 50-g ball rolls across a table at 2 m/s.
Momentum = .050 kg (2m/s) = 0.1 kg m/s

A 100-g rolls across the same table at 1 m/s.
Momentum = .100 kg (1 m/s) = 0.1 kg m/s

The momentum of the two systems are equal as we can see the values above.

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