A String Is Stretched by a Force of 4 $\times$ 10^-4 Kg/m

Multiple Choice

A string is stretched by a force of 4.0 N.The mass per unit length of the string is 4.0 $\times$ 10^-4 kg/m.A transverse wave would travel along this string with a velocity of approximately

A) 0.80 cm/s
B) 2.0 cm/s
C) 8.0 cm/s
D) 50 m/s
E) 1.0  10² m/s