Q.

An insect jumps from ball A onto 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?

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answer is 8.

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Detailed Solution

For completing the full circle:u2=5gL⇒u=4 ms−1Relative velocity =2u=8 ms−1
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An insect jumps from ball A onto 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?