The qualitative equivalent of internal validity is: A- Credibility

B- Dependability

C- Transformability

D- Confirmability

Need asap ‼️ 20 pts which gravitational force field diagram is drawn correctly? (answers in pictures below)

The radius of an atom is closest in size to a

Arailroad car collides with and sticks to an identical railroad car that is initially at rest. after the collision, the total kinetic energy of the two cars is a) the same as before. b) half as much as before. c) one third as much as before. d) one fourth as much as before. e) twice as much as before.