Rachel and Sarah are on a bus travelling at 5 mph past John who is standing on the sidewalk. Rachel then throws a ball forward to Sarah at a speed of 20 mph in the frame of reference of the bus. From the point of view of John, the ball is traveling
with a speed of
x
Select one:
a. 20 mph
b. 25 mph
c. 15 mph
d. 5 mph

I think C

Explanation:

Since the bus is moving away from John.

{C - V}.

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.