I need help on this as quickly as possible. It is about Newton's Third Law as well as the law of conservation of momentum. I have everything else down but mainly need help with question #3. I believe that the answer for question number three is something on the lines of Newton's Third Law and how forces act in an equal and opposite manner but am not sure. Thanks

This is important. 1. which of the following is an si base unit for measuring length? (2 points) inch gram meter mole 2. which of the following units for distance is an si unit? (2 points) centimeter foot inch yard 3. which of the following tools should a scientist use to measure an object in meters? (2 points) electronic balance pan balance tape measure thermometer