A gun fires a projectile of mass 10 Kg. The muzzle velocity is 160 m/s. If the barrel be elevated at angle 20, find the following: (a) The range (R) without air resistance * (b) Consider the drag coefficient to be small ( k=0.022), the decrease in R in the case of air resistance is approximately equal to *

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A: Speed of projectile       vo = 368.0 m/s Angle with the horizontal     θ = 70.8°