A particle is launched from the origin on the ground with an initial velocity v = (2.40 m/s) x+ (2.00 m/s) y. The particle falls freely under earth’s gravitational field. a. Find the angle at which the particle is launched at origin. (angle made to positive x axis). b. How far does the particle move in the x direction? c. What is the particle’s velocity at this time? d. How long it stays in the air

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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.