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1) Up until now we have always ignored air resistance. We should now add it. Let us just think of simple 1-dimensional problewith air resistance. We can model the air resistance as a force proportional to the velocity, fair = bu. The coefficient b is

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fair = bv b = Dimensions of b ma b= V b= V b = kg/s With increase in velocity resistive force also increases constant b in adWhen ball achieves terminal velocity net force on the ball becomes zero Fner = 0 mg - bvz = 0 VT mg b Now Fner = ma mg - by =t Now dy V= dt dy dt mg b х (1-e-b) I dy = mg b 0 * (1-e-be)dt H Y-H= - -5 0 mg e-by y-H= + b 6 mg y= H.

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