A 40-kg boy is sliding on a horizontal and frictionless surface with an initial momentum of 90 J due east. When t-0, a force, as a function of time, F=8.20t is applied to the boy due west. At what value of t will result in the momentum of the boy 60 J due west? What is the acceleration of the boy at that time computed in (a)? a. b.

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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.