45 kg boy running at 3 m/s land on a 9 kilograms sled that is standing still if the boys stays on the sled find the resulting speed of the slide with the boy aboard

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