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This is the second part of a question bank for falcons final mbbs. We will understand what is the problem and how to fix it. For more help and information read this article: falcons final mbbs part 1 question bank pdf Question (1) According to David, an articulated truck can reach a maximum speed of 60 miles per hour because the idle speed cannot exceed that speed. How would you explain this fact, using the concepts of momentum and energy? Answer (1) Firstly , we will understand what is momentum and how it will help us to answer our questions. Momentum is the product of mass times velocity(P = mv) when you are moving your body at a constant speed, your body will have momentum when if you stop your body abruptly then your body will have more momentum. Now when articulated truck starts its journey at rest then its initial speed is zero so P = 0mv or m0v0=0 because the equation represents initial state in physics. So the final velocity of articulated truck cannot exceed 60 miles per hour. Secondly, we will understand what is energy and how it will help us to answer our questions. Energy is the ability to do work, so when truck starts its journey then it has energy due to its mass, now as articulated truck moving its body at constant speed then kinetic energy of the articulated truck will form according to this equation: K = ½mv² , Now when articulated truck start from rest then its initial kinetic energy will be zero so ½mv²=0 ,because equation is in initial state so v=zero . So final velocity of articulated truck cannot exceed 60 miles per hour. Thirdly, we will understand what is momentum and how it will help us to answer our questions. Momentum is the product of mass times velocity(P = mv) when you are moving your body at a constant speed, your body will have momentum when if you stop your body abruptly then your body will have more momentum. Now when articulated truck starts its journey at rest then its initial speed is zero so P = 0mv or m0v0=0 because the equation represents initial state in physics. So the final velocity of articulated truck cannot exceed 60 miles per hour. Question (2) A train of length 2 m moves with a uniform speed of 4 m/s starting from rest. A bird of mass 100 g is sitting on the train at rest. We know that kinetic energy = ½mv². Assume that the bird moves parallel to the train in air. cfa1e77820