Question

An insect moves along a circular path of radius 10 cm with a constant speed. If it takes 1 minute to move from a point on the path to the diametrically opposite point, then what is the distance it travels and average velocity of the insect respectively?

• A. 3.14 cm, 20 cm $(min{)}^{-1}$
• B. 31.4 cm, 0.33 cm $s^{-1}$
• C. 0.314 cm, 1 cm $(min{)}^{-1}$
• D. 314 cm, 0.1 cm $(min{)}^{-1}$

Answer 1

The correct option is B 31.4 cm, 0.33 cm $s^{-1}$

Distance $=\pi \ast r=10\ast 3.14=31.4cm$.

Time $1min=60s$

displacement $=20cm,$

velocity$=\frac{displacement}{time}=\frac{20}{60}=\frac{1}{3}=0.333cm/s$.