Question

The diagram shows the $\text{displacement}-\text{time}$ graph for a particle moving in a straight line. Find the average velocity for the interval from $t=0$ to $t=5s.$

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

Answer 1

The correct option is A $-2m{s}^{-1}$


As we know,
$\text{Avergae velocity}=\frac{\text{Total displacement}}{\text{total time}}$
Therefore, according to graph,
Displacement,
($\Delta x$)$=x_f-x_i=-10-0=-10m$
Time taken$\left(t\right)=5\text{sec}$
Average velocity= $-\frac{10}{5}$=$-2m/s$
Final Answer: (a).