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Alice swims across a stream of width d = 300 ft.
The stream flows from west to east with current speed vC
of 10 ft / minute.
If there were no current, as in a pool or a lake, Alice would swim with speed
vA of 20 ft / minute, in the direction indicated in the picture above,
f = 20 degrees.
Find the position xo along the x-axis where she will come out across the
stream. Note that
f is the angle between the y-axis and the swimmer's velocity
east (downstream) is defined as positive x, west (upstream) is defined as negative x
For example, the x-component of the velocity pointing east is positive, and
the x-component of the velocity pointing west is negative.
If you enter an expression, use degrees as arguments for sin and cos, rather than radians.
xo = ft