Question

A person completes a round of circular track of radius $R$ in $40\text{s}$. At the end of $2\text{minutes}$, displacement will be

• A. $2\pi r$
• B. $3\pi R$
• C. Zero
• D. $7\pi R$

Answer 1

The correct option is C Zero


$2\text{minutes}\to 120\text{s}$
One round in $40\text{s}$
$\Rightarrow \frac{120}{40}\Rightarrow 3\text{rounds}$
As, the person comes back to his initial position at the end of $2\text{minutes}$
$\Rightarrow$ Displacement $=$ Zero