If an object of mass m1 = 0.55 is sliding without friction in the +x-direction on a level surface at a speed of = 0.72 m/ and it collides with a stationary object of mass m1 = 0.55 determine the total initial and total final momenta (before and after the collision) as well as the total initial and final mechanical energy (before and after the collision) for a perfectly elastic collision.

Explanation:

As we know that for perfectly elastic collision total mechanical energy is always conserved

so we will have

now we also know that total moment of the system is conserved in any collision because there is no external force on it

so we will have

when it gains or loses electrons

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.