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 m s - 2 )

Step-by-step solution

Velocity in a string, at a distance x , is given by v = µ g x µ = g x ⇒ d x d t = g x ⇒ ∫ 0 20 d x x = g ∫ 0 t d t On integrating, we get, t = 2 2     s