Question 1 The graph below shows the distance x (km) – time t (s) for a car of mass 450 kg travel travelling unde frictionless motion between the points A and B. 1). Describe and determine the velocities at the points A (VA) and B (Ve). 2). Evaluate the change in kinetic energy between the points A and B and find the work done by the net force acting upon the car. What is the corresponding average power? 3). Calculate the average acceleration between A and B. x (km) 100 250 t(s) Question 2 A suspended homogeneous rod AB of length, 75 cm and mass of 5 kg is rotating about one of its end (A) at an angular velocity of 10.24 rad s". 1). Calculate the moment of inertia I of this rod. 2) What is the corresponding linear velocity of the free end, B? 3) The end B hits and sticks to a ball of radius R-12.5 cm and mass 850 g moving in the opposit direction with a linear velocity of 5.48 m.s". Use the principle of conservation of momentum to fine the linear velocity of the ball-rod system after the collision. (Assume that the collision is inelastic).

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Special Relativity

The theory of special relativity discusses how space and time are related to objects traveling along a straight line at a constant speed. Simply stated, as an object reaches the speed of light, its mass becomes infinite and it is unable to move faster than light. This interstellar speed limit has been the topic of much debate in astronomy, and also in science fiction when people consider how to fly over large distances.