question_answer

A string of length 40 cm and weighing 10 g is attached to a spring at one end and to a fixed wall at the other end. The spring has a spring constant of 160 N/m and is stretched by cm. If a wave pulse is produced on the string near the wall, the time it will take to reach the spring is\[\frac{1}{x}\]. The value of x (in second) is

Answer:

20