Posted by SANDEEP SINGH on Thursday, March 22, 2012 at 7:34am.
You should have been taught about this formula for the wave speed, V.
V = sqrt (T/d)
T = tension = 49 N
d = density per length = 0.04/8 = 0.005 kg/m
V = sqrt(49/.005) = 99 m/s
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