Question

A particle goes from point $A$ to point $B$, if moving in a semicircle of radius $1.0 \,m$, in $1.0\, s$, as shown in the figure. The magnitude of the average velocity of the particle is

• A. $3.14\, ms ^{-1}$
• B. $2.0 \,ms ^{-1}$
• C. $1.0\, ms ^{-1}$
• D. zero

Answer 1

Answer: (B)

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

or $ \vec{v}_{a v}=\frac{\Delta \vec{r}}{\Delta t}$
As, displacement is $A B=2\, m$
$\vec{v}_{a v}=\frac{2 m}{1 s}=2 \,sm ^{-1}$