I searched for you and i think its Velocity. it would be nice if u put the answer choices though
Calcium has 2 valence electrons
Angular momemtum : mass * tangential speed * distance to the center = 50*2.1*3.6=37800 J.s
-- The area under a velocity/time graph, between two points in time, is the difference in displacement during that period of time.
-- The area under a speed/time graph, between two points in time, is the distance covered during that period of time.
The formula for average speed is
So we can just substitute our data.
- its the result
