Afreight train rolls along a track with considerable momentum. if it were to roll at the same speed but had twice as much mass, it's momentum would be

The momentum would be doubled

Explanation:

The magnitude of the momentum of the freight train is given by:

where

m is the mass of the train

v is its speed

In this problem, we have that the speed of the train is unchanged, while the mass of the train is doubled:

therefore, the new momentum is

so, the momentum has also doubled.

probably not the "magnets"in the magnet, so to speak, are thought to be electrons orbiting in shells. vurrent loops two sides to the loop