Question

5 which choice is a unit of speed? a. h/mi b. km/h c. m²/s d. n·m²

Explanation:

Step1: Recall speed formula

Speed = $\frac{distance}{time}$.

Step2: Analyze each option

• Option A: $\frac{h}{mi}$ is time per distance, not speed.
• Option B: $\frac{km}{h}$ is distance (kilometers) per time (hours), which is a unit of speed.
• Option C: $\frac{m^{2}}{s}$ is area per time, not speed.
• Option D: $N\cdot m^{2}$ is a unit - related to force and area, not speed.

Answer:

B. km/h