When an electron loses or gains a charge, it becomes?

The graph describes the motion of an object. the object moves with from a to b. it from b to c. it moves with from c to d.

Alead ball is dropped into a lake from a diving board 5m above the water . it hits the water with a certain velocity and then sink with constant velocity in bottom . it reaches the bottom 5 second after it is dropped if g= 10m/s2 . find depth of the lake and average velocity of the ball ?

How will the system respond to a temperature increase?