Asled of mass m is being pulled horizontally by a constant horizontal force of magnitude f. the coefficient of kinetic friction is ? k. during the time interval ? t = t, the sled moves a distance s, starting from rest.

Jenny wants to test the electrical conductivity of two substances dissolved in water. she is preparing the containers for the experiment. which factor is most important for her to control? a) volumes of the solutions b) appearance of the solutions c) temperatures of the solutions d) concentrations of the solutions