A 20 metric ton train moves toward the south at 50 m/s. At what speed must it travel to have four times its original momentum

200 m/s

Explanation:

as momentum is a product of mass and speed, and mass is not changing, four times the speed will result in four times the momentum.

p = mv

4p = m(4v)

it is very well related to a lot of things but with my limited knowledge i can confidently say that the answer is space.

a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.