Vibrations of period 0.25 s propagate along a straight line at a velocity of 48 cm/s. One second after the emergence of vibrations at the initial point, displacement of the point, 47 cm from it is found to be 3 cm. [Assume that at initial point particle is in its mean position at t=0 and moving upwards]. Then,
a. amplitude of vibrations is 6 cm
b. amplitude of vibrations is 32 cm
c. amplitude of vibrations is 3 cm
d. None of these