2. a race car starts at 400 m/s and then stops in 20 seconds. calculate acceleration. acceleration=final velocity - initial velocity/ change in time
a. -20 m/s2
b. 40 m/s2
c. 20 m/s2
d. 55 m/s2

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 think the answer is a and b

i wish you luck