Please help me with both of the following questions. 1.  How fast must a 250. gram cart be traveling to have a momentum of .450 kgm/s? 2.  If the above ball comes to rest in the catcher’s mitt in .085 seconds, how much force does the ball apply on the catcher’s mitt?  (hint: use the impulse-momentum theorem )

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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.