What is the combined effect of mass and velocity is taken into account by a physical quantity called?

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An object experiences a net zero external unbalanced force. Is it possible for the object to be travelling with a non-zero velocity? If yes, state the conditions that must be placed on the magnitude and direction of the velocity. If no, provide a reason.

Yes, even when the net external force is zero, an object may travel with non-zero velocity. 

A rain drop falls downwards with a constant velocity. The net force on the drop is zero because the weight of the drop is balanced by the upthrust and the viscosity of air. 

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