Answer :
The seesaw will not move, because both of the persons will have moved the same amount, so the overall weight on either side will remain balanced.
The seesaw will remain balanced. This is because the two masses are equal, and each is moving the same distance away from the pivot point. Since the pivot point is massless, the distance of each mass relative to the pivot point is the only factor that affects the balance of the seesaw. Since each mass has moved the same distance away from the pivot point, and the pivot point has not changed, the seesaw will remain balanced. In order to cause the seesaw to become unbalanced, one of the masses must move further away from the pivot point than the other. The further away the mass is from the pivot point, the greater the torque it will produce, causing the seesaw to tilt. For the seesaw to stay balanced, the torques from each mass must be equal, so the masses must remain the same distance from the pivot point.
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