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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