An object is shot straight upward from sea level with an initial velocity of 350 ft/sec. Assuming that gravity is the only force acting on the object, give an upper estimate for its velocity after 5 sec have elapsed Use g=32 ft/sec² for the gravitational acceleration. B. Using t = 1 sec, find a lower estimate for the height attained after 5 sec. a. The upper estimate for the velocity after 5 sec is B.

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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.