question_answer

A uniform string of length 20m is suspended from a rigid support. A short wave pulse is introduced at its lowest end. It starts moving up the string. The time taken to reach the support is:                        [JEE MAIN - I 3-4-2016] (take)

A)                             

B)

C)                               

D)

Correct Answer: D

Solution :

[d] Velocity at point