Question

part b what was swimmer as average speed during the period 10 min to 20 min? 40 m/min 0 m/min 400 m/min 4000 m/min

Explanation:

Step1: Recall speed formula

Speed = $\frac{\text{Distance}}{\text{Time}}$. We need to know the distance Swimmer A swam in the 10 - 20 min period and the time interval. The time interval $\Delta t=20 - 10=10$ min. But since no information about the distance is given in the problem - if we assume Swimmer A did not move during this period (no other data to suggest otherwise), the distance $\Delta d = 0$ m.

Step2: Calculate average speed

Average speed $v=\frac{\Delta d}{\Delta t}=\frac{0}{10}=0$ m/min.

Answer:

B. 0 m/min