Calculating Force of Water Resistance on a Motorboat

[lindzpooh]

hlpe please!

Homework Statement

a motorboat that develops 50kW covers a distance of 1km in 6min. with how much force did the water resist the motion of the boat?

Homework Equations

The Attempt at a Solution

 

[Mindscrape]

I would use your definitions.

$$P(t) =\frac{dW}{dt} = \frac{d}{dt} \int \mathbf{F} \cdot ds = \mathbf{F}(t) \cdot \mathbf{v}(t)$$

You have to try something. Basically, with the information you have provided, you could be able to solve differential equations for all I know.