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The end of a chain of length L and mass ...

The end of a chain of length L and mass per unit length `rho`, which is piled up on a horizontally platform is lifted vertically with a constant velocity u by a variable force F. Find F as a function of height x of the end above platform:

A

`rho(g x +2u^(2))`

B

`rho(2gx +rho u^(2))`

C

`rho(gx+u^(2))`

D

`rho (u^(2)-gx)`

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