The Motor constraint page has no helpful information about the units for the velocity parameter
'Copy Rotation' constraint computes the axis rotation value that should not be modified (like the Z axis when you only specify the X and Y)
@PratikPB2123 : I'm curious about the modeling module being set here and wanted to check in case this was a mistake.
'Copy Rotation' modifier acts oddly if the Z rotation is not copied in this test case