Erica throws a tennis ball against a wall, and it bounces back. Which force is responsible for sending the ball back to Erica?

A. the force that the ball exerts on the wall

B. the frictional force between the wall and the ball

C. the acceleration of the ball as it approaches the wall

D. the normal force that the wall exerts on the ball

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atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8

metric time was an attempt to create a standard unit of time based off of 10, but it never took off an is not included in the metric system (si)