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F(air) = cv^2

Where, F = Resistance force by air

C = force constant

V = velocity of air

Air resistance depends on two main factors:

1. Shape of the object: If the shape of the object is very large compare to its mass, so that it has too much surface area which block too much air in the direct of the motion, the air resistance will affect the motion of object.

2. Mass of the object: If the mass of object is very less, the air resistance will come over it and it will not allow to move the object with its original speed.

Velocity, v = 12 ms^-1

Force , F = 72N

Using the equation, F = cv^2

c = F/v^2 = 72/(12)^2 = 0.5

Velocity, v = 25 ms^-1

Force constant, c = 0.5

Using the equation, F = cv^2 = 0.5 x (25)^2 = 312.5 N