Two objects each moving with speed v travel in opposite directions along a straight line passing through both their centers. the objects stick together when they collide and move together with speed v/4 after the collision.
(a) what is the ratio of the final kinetic energy to the initial kinetic energy? ( kf/ki = 1/16)
(b) what is the ratio of the mass of the more massive object to the mass of the less massive object? ( mmore massive/mless massive = 5/3)

Explanation:

= Mass of first object

= Mass of second object

v = Speed of both objects

= Combined velocity

The ratio of final kinetic energy to initial kinetic energy will be

The ratio is

As the linear momentum is conserved

Divide by on both sides

The ratio of mass is

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.