which units are used to measure both velocity and speed? select three options. m/s d/t km/h mph m²

Explanation:

Step1: Recall speed and velocity definitions

Speed and velocity are rates of motion. Speed is a scalar, velocity a vector, but both have units of distance per time.

Step2: Analyze each option

• $\text{m/s}$: It is distance (meters) per time (seconds), a valid unit for speed and velocity.
• $\text{d/t}$ is a ratio, not a unit.
• $\text{km/h}$: It is distance (kilometers) per time (hours), a valid unit for speed and velocity.
• $\text{mph}$: It is distance (miles) per time (hours), a valid unit for speed and velocity.
• $\text{m}^2$ is a unit of area, not for speed or velocity.

Answer:

A. m/s, C. km/h, D. mph