Can someone help please T-T

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

A51 kg woman skis down a hill and her kinetic energy is 9.96e4 j. what is her speed?

1. do the particles in the medium material move in the same direction of the wave or at opposite direction to the wave? explain your answer. 2. by inputting more energy into the wave, i. e a large shake of the spring, which wave property also increases? 3. are there forces of friction acting while a wave is passing through a medium?