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A particle moves in the manner shown by the velocity-time graph below. The displacement of the particle has been measured so that it is zero at t = 0. Point Q refers to a point in its motion. A particle oscillates with simple harmonic motion with period T. At time t = 0, the particle has its maximum displacement. Which graph shows the variation with time t of the kinetic energy 𝐸_𝑘 of the particle? A block attached to a spring is oscillating in simple harmonic motion between x = +A and x = -A. A graph of position x as a function of time t for the block is shown below. At which of the time labeled times is negative work being done on the block by the spring? A spring of force constant k is stretched a certain distance. It takes twice as much work to stretch a second spring by half this distance. The force constant k2 of the second spring is