Question 2 A wagon of mass 150 tonnes, starts from rest and travels 75 metres down a 5% grade and strikes a post with bumper spring as shown in Figure below. 75 m Iwwwa If the rolling resistance of the track is 50 N/t, find a) The velocity with which the wagon strikes the post. b) Also find the amount by which the spring will be compressed, if the bumper spring compresses 1 mm per 25 kN force.

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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.