An iceboat of mass
**M = 250 kg**
sits motionless on a frozen lake.
The boat is tied to a stake by a rope of length
**R = 100 m**.
A steady wind starts to blow from the West,
pushing the boat with
a constant force
**F = 150 N**.
The boat slides along the ice,
moving in a circular arc as the rope
stretches taut.
The coefficient of kinetic friction between
the boat's runners and the ice is
**mu_k = 0.03**.

How fast is the boat moving when it reaches the point marked "X"?

You can do this problem by breaking it up into two pieces:

- calculate the work done on the boat by the wind (just as in the previous problem)
- calculate the work done on the boat by friction