Question

A particle is moving a long $x-axis$ at time $t_1=2s$, its position is $x_1=3m$ and at time $t_2=7s$, its position is $x_2=18m$.The average velocity of the particle is

• A. $2$ $m{s}^{-1}$
• B. $3$ $m{s}^{-1}$
• C. $4$ $m{s}^{-1}$
• D. $5$ $m{s}^{-1}$

Answer 1

The correct option is B $3$ $m{s}^{-1}$

The average velocity of the particle is the ratio between the displacement and the time.

$v_{avg}=\frac{x_2-x_1}{t_2-t_1}$

or, $v_{avg}=\frac{18-3}{7-2}$

or, $v_{avg}=3m/s$ is our required answer.
The correct answer is option (B).