ii. On the axes below, draw graphs of the total momentum p of the two-cart system (where positive momentum is rightward momentum) and the total mechanical energy E of the two-cart system (where the top of the platform is zero gravitational potential energy) as a function of time for the interval between t = 0 and t = 8 seconds. Ap (kg-mis) I' (J) +100 100 +80 +60 +10 120) 6 (S) 20 -$0 GO -100 190 PART B: Suppose that the platform's wheels are free to roll, but the platform has much more mass than If +