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oahsen

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**a problem from giamcoli ( it is urgent )**

i am trying to solve this problem for several days. pls help me. it is from giancoli 3. edith.

a heavy steel cable of length L and mass M passes over a small massless,frictionless pulley. a)if a length y ahngs on one side of the pulley ( so L-y hangs on the other side) calculate the acc of the cable as a fuction of y b)calculate the vf of the cable as a function of y( y is changing)... (the book gives a hint that "use the chain rule and integrate)

i ve found the acc= g*(2*m*y-m*L)/m*L ( i hope it is so )

but how can i find the V... i know a=dv/dt but y,v,t is not constant there and i don't know what i do with 3 non-onstant terms?