A mass attached to a spring oscillates with a period of 3.15 s.
negative x direction
Angular vel of shm = ω = 360º/3.15s = 114.3º/s
Amplitude of shm .. a = 0.0390m
As the oscillation starts from max displacement (a), displacement x is given by
x = a cos(ωt)
x = 0.0390 cos(114.3º/s x 6.89s)º
x = 0.0390 cos 787.527º
x = + 0.015 m
the mass moving in the positive x direction at t = 6.89 s
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