6. A ball, initially at rest on a horizontal surface, is hit with a time-dependent force applied in the positive direction. The magnitude of the force, as a function of time, is represented in the graph below. Which of the five graphs shown below correctly represents the variations of momentum as a function of time for the ball? Force as a function of time 0.9 0.8 0.7 0.6 0.5 0.4 0.3 02 0.1 3 6 10 Time (ms) Momentum as a function of time Momertuma function of me Momentum as a function of time Time (ms) Time (ms) Time (ms) Momentum as a function of time Momentum as a function of time Time (ms) Time (ms) c) C b) B d) D e) E a) A Momentum ( Momentum (Ns) Force (N) ш (N) unuw Momentum Momentum

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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.