Electromagnet is not a permanent magnet. The electromagnet consists of wrapping the coils around the iron rod.
When the current passes through it it will retain its magnetic property. Iron retains the magnetic property as the current flows in the electromagnet. Iron is a ferromagnetic material.
It will loose its magnetism easily when the power is switched off.
The strength of the magnetism depends on the number of turns and the amount of current flowing through it.
It's average speed during that 26 seconds was about 4.77 m/s. Without seeing the graph, we can't tell if it was going faster or slower at any particular time during that period. All we can tell is its average for the full interval.
Since the illuminated side of the moon appears to be getting smaller in size (after the full moon), the moon is said to be in the "erosion phase". For the next 7 days, the moon will remain in an “eroded gibbous stage”.
