The graph above represents the data from Activity 3 in this week's lab describing the position of a moving cart as a function of time. The equation for the best-fit line for this position vs. time graph is y = 3.9609x + 0.1739. What is the speed of the cart? [All the quantities are measured in standard units. Do not include units in your answer.]

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Relativistic Energy and Momentum

According to classical physics, time flow is the same for every observer. But according to einstein's theory, time flow is different for different observers. The idea that time flow is not the same for all may sound strange because we may not experience this effect in everyday life. This effect is only observed when an object moves with some velocity comparable to the velocity of light. This velocity is termed relativistic velocity.