A mass hangs from a spring and is set into vertical oscillation with a frequency of 1.25 Hz. When the mass is at the highest point of its motion, the string is stretched by 4.00cm. A stopwatch is started during the motion and it is found that the mass is 5.00cm below the equilibrium position and is moving upwards when t=0.200s. Calculate:
a) the angular frequency
b) the extension of the spring when the mass is at the equilibrium position
c) the amplitude of the motion
d) the phase angle
e) the speed of the mass when t=0.200s.


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