A uniform string of length 20 m 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 : (take g = 10 ms−2)

  • Option 1)

    2\pi \sqrt{2}\: \: s

  • Option 2)

    2s

  • Option 3)

    2\sqrt{2}s

  • Option 4)

    \sqrt{2}s

 

Answers (1)

As we learnt in

Simple Harmonic Motion -

It is special case of oscillatory motion of a vibrating particle in which the acceleration at any position is directly propotional to displacement from mean position & it is directed towards mean position.

- wherein

\vec{a}\; \alpha -\vec{x}