A pulse was created in a stretched string of length 5 m by four students Raju, Babu, Balu and Ramu. They observed that pulse returned after reflection at the point of creation 5 times in 10 seconds and calculated the speed as given below
$\begin{matrix} S t u d e n t & R a j u & B a b u & B a l u & R a m u S p e e d m / s & 0.5 & 2.5 & 5 & 10 \end{matrix}$
Who calculated the speed correctly?

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Solution

Distance travelled by pulse in returning one time =5m +5m =10 m
Since it is returning 5 times, total distance $= 5 \times 10 = 50 m$ speed $= 50 m / 10 s = 5 m / s$

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Distance travelled by pulse in returning one time =5m +5m =10 m Since it is returning 5 times, total distance =5×10=50 m speed =50 m/10s=5 m/s

Distance travelled by pulse in returning one time =5m +5m =10 m
Since it is returning 5 times, total distance $= 5 \times 10 = 50 m$ speed $= 50 m / 10 s = 5 m / s$