What is the relationship between the change in vocity and severity index?

Velocity is a physical vector quantity. It has a magnitude as well as direction.

Speed is a scalar quantity. Velocity is a vector quantity.

Speed ascertains how fast a body moves. Velocity ascertains the object's speed and the direction it takes while moving.

the pull of gravity on the rocket decreases

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.