A locomotive of mass 1.1 X 105kg pulls behind it two train cars, connected one after the other, each with mass 8.1 X 10'1 kg. The entiretrain begins to accelerate at 0.5m/52. Throughout this problem you may assume that the ground exerts no horizontal force on the green and purple train cars. Image size: s M L it: Part a What horizontal forces must act on the locomotive? Select the correct answer 0 A backward force by the \"lat wagon and a smaller forward force by the ground. 0 A backward force by the lat wagon and an equal and opposite forward force by the ground 0 Only a forward force by the ground 0 A backward force by the let wagon and a greater forward force by the ground 0 Only a backward force by the 1st wagon Part b What is the net horizontal force on the last train car (purple) ? Please enter a numerical answer below. Accepted formats are numbers or "e" based scientific notation e.g. 0.23, -2, 1e6, 5.23e-8 Enter answer here NPart 0 Draw a free body diagram for the let (green) train-car. Find the pulling force exerted by the locomotive on this 1st (green) train car. Part d Draw a free body diagram for the locomotive. What is the horizontal force exerted by the ground on the locomotive? (Enter 0 if there is no such force). Please enter a numerical answer below Accepted formats are numbers or \"e\" based scientific notation e.g. 0.23,72,1e6,5l23e78 Enter answer here