First slide
Conservation of mechanical energy
Question

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?

Moderate
Solution

For completing the full circle:

u2=5gLu=4 ms1

Relative velocity =2u=8 ms1

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