Question

boy A apply 5N force on a car in South direction then find their resultant force . But if boy c is applying 5N force in North direction then find resultant force between B and C​

Answer 1

The presence of different amounts of various gases in air doesn't mean that air would be heterogeneous mixture.

Always, mixture of two or more gases is homogenous mixture, irrespective of the amounts of various gases present in the mixture.