Self-oscillation period

The water in the vessel carried by the boy has a self-oscillation period of 0.8 s. What is the size of the boy's movement speed when the length of the boy's step is 60 cm? Give the result in m/s.

Correct answer:

v =  0.75 m/s

Step-by-step explanation:

$$\begin{gathered} T=0.8\text{s} \\ s=60\text{cm}\to \text{m}=60:100\text{m}=0.6\text{m} \\ \lambda =vT \\ s=v\cdot T \\ v=s/T=0.6/0.8=0.75\text{m/s} \end{gathered}$$

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