Question: A string is strung over a pulley and a block of mass 15 kg is attached. The string is plucked and you notice that the

A string is strung over a pulley and a block of mass 15 kg is attached. The string is plucked and you notice that the wave travels with a speed of 6.1 cm/s along the string. The mass is replaced by an unknown mass, and when the string is plucked, the waves moves with speed 5.8 cm/s. What is value of the unknown mass

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