Speed is the ratio of the distance an object moves to
a. the amount of time needed to travel the distance.
b. the direction the object moves.
c. the displacement of the object.
d. the motion of the object.

beta is electron from nucleus

something from nucleus has changed, but charge must be same for cons of charge

false.

explanation:

this statement is false. after falling for 5 seconds, its speed will not be 100 m/s.