Constants An iron block with mass mg sides down a trictionless hill of height H. At the base of the hill,it collides with and sticks to a magnet with mass mu • Part A What is the speed v of the block and magnet immediately after the collision? > View Available Hint(s) O v = ( 2gH Ov- ( ) 2gH O- ( 29H Submit • Part B Now assume that the two masses continue to move at the speed e trom Part A until they encounter a rough surface. The coefficient of triction between the masses and the surtace is . If the blocks come to rest after a distance s, which of the following equations would you use to finds? View Available Hints) o ma gH = umags gH = umugs gH - p(ma + mM)gs o m gH = -µ(mg + mu)gs gH - p(ma + mM)g

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Proper Length

The theory of special relativity explains the connection between space and time to objects that move in a straight line at a constant speed. The objects move at the speed of light. When an object approaches light speed, its mass is endless and cannot move faster than light. The most crucial postulate of Einstein's special relativity is that the laws of nature do not change in each frame of reference.