Question

A particle moves according to the equation $x=t^2+3t+4$ . The average velocity in the first $5\text{s}$ is

• A. $8{\text{ms}}^{-1}$
• B. $7.6{\text{ms}}^{-1}$
• C. $6.4{\text{ms}}^{-1}$
• D. $5.8{\text{ms}}^{-1}$

Answer 1

The correct option is A $8{\text{ms}}^{-1}$

Average velocity after 5 seconds is:
$\overline{v}=\frac{x_5-x_0}{5}=\frac{25+15+4-4}{5}=8m/s$