When t = 0. the mass is in the position in which the spring is unstrelched and has a veloc...

When t = 0. the mass is in the position in which the spring is unstrelched and has a velocity of 0.3 m/s to the right. Determine the position of the mass as a function of time and the amplitude of the vibration

(a) by expressing the solution in the form given by Eq. (21 .8) and

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(b) by expressing the solution in the form given by Eq. (21.9).