1. (a) Briefly introduce the Newtonian mechanics (b) Two trains are traveling along a straight track, one behind the other. The fist train train is travelling at 12m/s. The second train approaching from the rear is traveling at 20m/s. When the second train is 200m behind the first, the operator applies the brakes producing a constant deceleration of 0.2m/s. Will the trains collide and if so, where and when? 2. (a) What do you understand by moment of inertia of a rigid body? (b) Calculate the moment of inertia and the radius of gyration of the following: (i) Solid cylinder of mass 40kg and radius 50cm (ii) Hollow sphere of mass 15kg and radius 2m.