Q5: A machine part having a mass of 5 Kg slides along a rail aligned with the x- axis .Its position is given as a function of time by [ x=(18m/s²)t²-(3m/s³)t³] Find the force acting on the body ,as a function of time .what is the force at time t=5s?for what time is the force negative?

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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.