Example from Physics, 2.2 Speed and Velocity

Solving for Time when Displacement and Average Velocity are Known

Phillip walks along a straight path from his house to his school. How long will it take him to get to school if he walks 428 m west with an average velocity of 1.7 m/s west?

Work it out on paper first. Then open the solution one step at a time, and stop as soon as you can finish on your own.

Strategy
We know that Phillip's displacement is 428 m west, and his average velocity is 1.7 m/s west. We can calculate the time required for the trip by rearranging the average velocity equation.
Solution
$\begin{matrix} v_{avg} & = & \frac{Δ d}{Δ t} \\ Δ t & = & \frac{Δ d}{v_{avg}} \\ = & \frac{428 m}{1.7 m/s} \\ = & 2.5 \times 10^{2} s \end{matrix}$
2.3

0 of 2 steps open

How did it go?

Strategy

Solution

Strategy

Solution