1. The problem statement, all variables and given/known data A cart starts from position 4 in the figure below with a velocity of 13 m/s to the left. Find the speed with which the cart reaches positions 1, 2, and 3. Neglect friction. speed at position 1 ___ m/s speed at position 2 ___ m/s speed at position 3 ___ m/s 2. Relevant equations E_tot1 = E_tot2 = E_tot3 = E_tot4 The total energy is kinetic energy plus potential energy E_tot = E_kin + E_pot E_pot = m * g * h with m the mass of the cart, g the gravitational constant of Earth (g=9.81m/s^2) and h the height. E_kin = 1/2 * m * v^2 3. The attempt at a solution I attempted to do this problem and I cannot figure out how to solve for any of them if I am not given the mass of the cart.