Question

In figure, displacement-time $(x-t)$ graph given below,

the average velocity between time $t=5\, s$ and $t=7 \,s$ is

• A. $8 \,ms ^{-1}$
• B. $8.7\, ms ^{-1}$
• C. $7.8\, ms ^{-1}$
• D. $13.7\, ms ^{-1}$

Answer 1

Answer: (B)

Given, $x_{2}=27.4 \, m , x_{1}=10\, m , t_{2}=7\, s$ and $t_{1}=5 \, s$.
Average velocity between $5\, s$ and $7 \, s$ is
$\bar{v}=\frac{x_{2}-x_{1}}{t_{2}-t_{1}}$
$=\frac{27.4-10}{7-5}=\frac{17.4}{2}=8.7 \, ms ^{-1}$