Question

Ramesh swims in a $90\text{m}$ long pool. He covers $180\text{m}$ in one minute by swimming from one end to the other and back along the same straight path. Find the average speed and average velocity of Ramesh, respectively.

• A. $3{\text{ms}}^{-1},3{\text{ms}}^{-1}$
• B. $3{\text{ms}}^{-1},0$
• C. $0,3{\text{ms}}^{-1}$
• D. $0,0$

Answer 1

The correct option is B $3{\text{ms}}^{-1},0$

Total distance covered in $1\text{min}=180\text{m}$

Net displacement in $1\text{min}=0$

$[$As Ramesh comes to the same point$]$

Now,

$\text{Average speed}=\frac{\text{Total distance covered}}{\text{Total time taken}}$

$=\frac{180}{60}=3\text{m/s}$

Further,

$\text{Average velocity}=\frac{\text{Net displacement}}{\text{Total time taken}}$

$=\frac{0}{60}=0$