<u><em>Answer:</em></u>
12 N
<u><em>Explanation:</em></u>
The concept of this question is based on <u>Newton's third law</u>
<u>This law states that:</u>
"For every action there is a reaction that is equal in magnitude but opposite in direction"
<u>The equation representing this law is:</u>
F₁₂ = -F₂₁
<u>Now, for the given problem:</u>
We have that the ball exerted a force of <u>12 N</u> on the net
Applying the above law, the net would exert a force of equal magnitude and opposite direction to that of the ball
Therefore, the net will exert a force of 12 N on the ball
Hope this helps :)