In the absence of air resistance, a projectile that lands at the elevation from which it was

Question:

In the absence of air resistance, a projectile that lands at the elevation from which it was launched achieves maximum range when launched at a 45° angle. Suppose a projectile of mass m is launched with speed v₀ into a headwind that exerts a constant, horizontal retarding force F_wind = -F_windî.
a. Find an expression for the angle at which the range is maximum.
b. By what percentage is the maximum range of a 0.50 kg ball reduced if F_wind = 0.60 N?

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