2. A 10 kg block slides from rest from the top of a 100 m long ramp that is elevated at one end by 50 m. It reaches a speed of 20 m/s at the bottom. a. Find the work done by friction on the block and the force of friction. b. What power is needed to pull the block up the plane at a constant speed of 5 m/s? c. A 2 kg hoop with radius 50 cm rolls without slipping from the top of the incline. Use conservation of energy to find its speed at the bottom and its rotational kinetic energy.

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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.