A runner travels $10m$ in $4s$ in a straight line. What is her average velocity?

• A. $2.5m/s$
• B. $5m/s$
• C. $1.5m/s$
• D. $2m/s$

Answer: (A)

Verified step by step guidance

1. Identify the given quantities: the displacement \(\Delta x = 10\ \text{m}\) and the time interval \(\Delta t = 4\ \text{s}\).
2. Recall the formula for average velocity, which is the displacement divided by the time taken: \(\bar{v} = \frac{\Delta x}{\Delta t}\).
3. Substitute the known values into the formula: \(\bar{v} = \frac{10\ \text{m}}{4\ \text{s}}\).
4. Simplify the fraction to express the average velocity in meters per second (m/s).
5. Interpret the result as the average velocity of the runner over the 4 seconds in a straight line.