Question

The frictional force of the air on a body of mass 1kg falling with an acceleration of 9.5m/s^2 is

Answer 1

f= 1 x 9.5 
f= 9.5 N 
firrction force here equal to the 9.5 N because the body fall with g 

Answer 2

From Newton's second law of motion, we know that

$Force=mass\times acceleration$

$Force= 1\times 9.5kg\times \frac{m}{sec^{2} }$

$Force=9.5Newton$

Newton's all three laws of motion can be studied deeply by the following links.

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Newton's first law in terms of acceleration

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