(only answer if you know the answer or I'll report) Solve it w the steps tysm​

 v_f = 20 m / s

Explanation:

For this exercise let's use the relationship between momentum and moment

        I = Δp

        F t = m v_f - m v₀

as the body starts from rest v₀ = 0

        F t = m v_f

        v_f =

let's calculate

        v_f = 4 2 / 0.4

         v_f = 20 m / s

the most reliable source of information.is wikipedia

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