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It's been a while since i study this but i think the answer is either 0n or 20n
0 0 0

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1.) If the forces are exerted in the same direction, then:
   10n + 10n = 20n to the direction of the forces
 The net force is 20n to the direction of the forces.

2.) If the forces are exerted on opposite directions, then:
   10n + -10n
 = 0
  There is no net force. The sum of all the forces is 0.

0 0 0
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