Question

The following diagrams each show in object of mass $m$ moving with instantaneous velocity $v$. III each $F$ is the applied force, and $f$ is the frictional force exerted on the object. In case, $I$, the object moves in circle with constant speed.

• A. None
• B. I only
• C. II only
• D. III only
• E. I,II, and III

Answer 1

The correct option is A None

$\begin{array}{c}\text{Correct option is}\left(A\right)\\ \text{As we know}\\ \text{In all the casses Fnet}\ne 0\\ \text{so,}a\ne 0\text{mean in none of the}\\ \text{case velocity remains constant.}\\ \begin{array}{cc}\text{Fret}& =F-f\\ & =200-100\\ & =100\end{array}\end{array}$