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An insect jumps from ball A on to ball B, which are suspended from inextensible light strings each of length L=8 cm The mass of each ball and insect is same .What should be the minimum relative velocity $({in ms}^{-1})$ of jump of insect w.r.t ball A, if both the balls manage to complete the full circle? $({g=10ms}^{-2})$

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Detailed Solution

For completing the full circle $\frac{u}{2} = \sqrt{5 g L} \Rightarrow u = 4 {ms}^{- 1}$

Relative velocity $2 u = 8 m s^{- 1}$

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