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c) The equation below describes the position r of a block attached to a spring at time t: x(t)-x,n cos (wt + ?) i. (2 marks) Explain in words the physical meaning of the variables xm, ? and ?. ii. (2 marks) Derive an expression for the velocity of the block. iii. (2 marks) The spring constant of your oscillator is 400 N/m. At some time the position, velocity and acceleration of the block are r-0.100 m, v- 13.6 m/s and a- -123 m/s The mass of the block is 0.325 kg. Calculate the frequency of the oscillation. iv. (4 marks) By using energy arguments, calculate the amplitude of the motion. (Use the data as in parti)

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