Question

at the start of a race, a runners velocity changes from 0 to 4.0 m/s. it takes him 2 seconds to speed up. his acceleration is m/s².

Explanation:

Step1: Calculate velocity change

\( \Delta v = 4.0 - 0 = 4.0 \, \text{m/s} \)

Step2: Compute acceleration

\( a = \frac{4.0}{2} = 2.0 \, \text{m/s}^2 \)

Answer:

2.0