How is an electromagnet different from a permanent magnet

An electromagnet shows both electric as well as magnetic property, and the materials comprising this type of property is mainly made up of a coil of insulated wire that is tied around a magnetic. When the current is allowed to pass through it, then it behaves as a magnet.

On the other hand, permanent magnet refers to those substances that are comprised of magnetized materials, and due to this, they have the ability to create a magnetic field of their own. These magnetic property shown by these substances are permanent and it remains for a long time.

truck y has a greater velocity than truck x.

one "light year" is the distance that light travels, through vacuum, in one julian year.   that's 365.25 days, of 24 hours each.