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One end of a rope is fastened to a boat and the other end is wound around a windlass located on a dock at a point 4m above the level of the boat. If the boat is drifting away from the dock at the rate of 2m/min, how fast is the rope unwinding at the instant when the length of the rope is 5m? ...?

Respuesta :

it seems that you need to solve this using phytagoras

x^2 + 4^2   = D^2

2xx'    =  yy'

y'    = xx'/y

y' = 3x2/5

= 6/5

hope this helps

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