What determines the time of flight (the time it takes to reach the ground) of a ball rolling off a table? The initial horizontal velocity of the ball.

The height of the table.

The ball will always reach the ground in the same amount of time, regardless of height

or velocity.

the entire statement is true and correct.  

there's no diagram, nothing is illustrated, and no question is asked.

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.

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.