A Boeing 707 jet aircraft has a takeoff mass of 1.2 x 10 kg. Each of its four engines has a net thrust of 75 kN. Calculate the acceleration and the length of the runway needed to become airborne if the takeoff speed is 73 m/s. (Neglect any frictional forces and air-resistance) a=2.5 m/s? d=1065.8 m

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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.