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# A particle moves with simple harmonic motion in a straight line . In first $\;\tau\;s\;$ after starting from rest it travels a distance a , and in next $\;\tau\;s\;$ it travels 2a , in same direction , then :

(a) amplitude of motion is 3a(b) time period of oscillations is $\;8\tau\;$(c) amplitude of motion is 4a(d) time period of oscillations is $\;6\tau\;$