The balloon is dropped (no initial velocity) from a height of 43.24 meters. At the exact moment you drop the balloon your friend throws a rock straight up to strike and burst the balloon before it lands. We will take the rock to be thrown with an initial velocity of 108 km/hr from an initial height of zero. Convert the rock's initial velocity into proper units. v0(rock) = meters/second Write an equation for the y of the balloon at any time. yballoon(t) = Write an equation for the y of the rock at any time. yrock(t) = Determine the time at which the rock and balloon collide. tcollision = seconds.

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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.