A block on a horizontal surface is attached to a horizontal spring of negligible mass. The other end of the spring is attached to a wall, and there is negligible friction between the block and the horizontal surface. The block- spring system is then placed into simple harmonic motion. The figure shows a graph of the velocity of the block as a function of time. At which of the following times does the block-spring system have maximum spring potential energy? 1.5 s В 2.0 s C 3.5 s 4.5 s

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Q: calculate the displacement over which the puck accelerates.

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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.