What flows in electricity?

Will you chech and finish these for me, because i am stumped with them.

What is the momentum of a 2 kg object moving at 15 meters per second

Two rigid transformations are used to map δhjk to δlmn. the first is a translation of vertex h to vertex l. what is the second transformation? a reflection across the line containing hk a rotation about point h a reflection across the line containing hj a rotation about point k