Reginald and Carlita have the same mass, M. Each of them stands on a skateboard on a frictionless surface. At time t = 0, Reginald throws a ball of mass m toward Carlita with horizontal velocity v. At time [ = 7, Carlita catches the ball at the same height from which Reginald threw it. A. Which student moves with faster speed after time 7? Explain your reasoning qualitatively without manipulating equations. B. Derive an expression for va, Reginald's velocity after time 7 in terms of M, m, v. and physical constants, as necessary. C. Derive an expression for ve, Carlita's velocity after time T in terms of M. m, v, and physical constants, as necessary. D. Explain how your expressions in parts B and C support your reasoning in part A. E. Let Ey be the mechanical energy of the Reginald-Carlita-ball system for t *0, let E, be the mechanical energy of this system for 0 7. Rank these energies from highest to lowest. Highest Energy Lowest Energy F. Explain your reasoning for your ranking in part E