Question

The frictional force due to air on a body of mass $0.25kg$ falling with an acceleration of $9.2{ms}^{-2}$ will be:

• A. $0.15N$
• B. $1.5N$
• C. $15N$
• D. $zero$

Answer 1

The correct option is A $0.15N$

From FBD, $ma=mg-f$
or $f=m(g-a)=0.25(9.8-9.2)$ take $g=9.8m/s^2$
$\therefore f=0.15N$