Car headrests act to [in the truest sense] * A) stop your head from being left behind when your body is rammed forward
B) stop your head from being forced backward

pe = weightxheight = 2000x1000=2,000,000joules

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.