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A heavy block 'B' is sliding with consta...

A heavy block 'B' is sliding with constant velocity u on a horizontal table. The width of the block is L. There is an insect A at a distance d from the block as shown in the figure. The insect wants to cross to the opposite side of the table. It begins to crawl at a constant velocity v at the instant shown in the figure. Find the least value of v for which the insect can cross to the other side without getting hit by the block.

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The correct Answer is:
`v_(min) = (uL)/(sqrt(d^(2) +L^(2))`
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