A long string having a cross-sectional area 0.80 mm and density 125 g cm, is subjected to a tension of 64 N along the X-axis. One end of this string is attached to a vibrator Imoving in transverse direction at a frequency of 20 Hz. At t=0, the source is at a maximum displacement y = 10 cm. (a) Find the speed of the wave travelling on the string. (b) Write the equation for the wave. (c) What is the displacement of the particle of the string at = 50 cm at time t= 005 s? (d) What is the velocity of this particle at this instant ?