Explanation:Answer
The volleyball should exert the same 20 N on Ana.
Step-by-step explanation
The 3rd Newton's law of motion states that, for any action, there is an equal and opposite force.
This means a body placed on top of a table exerts a force, say X N, on the table. For the table to hold that body it must be exerting an equal force (X N) to the body.
∴ If Ana exerts a force of 20 N on the volleyball,