1.Tests reveal that a normal driver takes about 0.75 s before he or she can react to a situation to avoid a collision. It takes about 3s for a driver having 0.1% alcohol in his system to do the same. If such drivers are traveling on a straight road at 30mph (44ft/s) and their cars can decelerate at 2ft/s^2, determine the shortest stopping distance d for each from the moment they see the pedestrian
2.A train starts from rest and travels 1 kilometer at uniform acceleration. The next 2 kilometers it travels at uniform speed. The train decelerates uniformly before coming to a rest. If the total time is 6 minutes, draw the v-t graph and determine the maximum speed of the train.