A railroad flatcar of mass 3,000 kilograms rolls to the right at 10 meters per second and collides with a flatcar of mass 2,000 kilograms that is rolling to the left at 5 meters per
second. The flatcars couple together. Their speed after the collision is

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.

i just did an experiment like this in my science class. also the answer is yes, it will get separated because they are two opposites meaning if they are opposite they can not attract.

hope this .!

the answer is 12 as i may remember

: )