The speed of propagation of a wave in a medium is 300 ms-1 . The equation of motion of point at x=0 is given by y=0.04 sin 600 ∩ t (meter). The displacement of a point x=75cm at t=0.01 s is
(a) 0.02 m (b) 0.04 m
(c) zero (d) 0.028 m
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