Question

which of the following would you need to measure instantaneous speed? (check all that apply) radar gun stopwatch measuring stick speedometer

Explanation:

• Radar Gun: It can measure the speed of an object at a specific instant by using radar waves, so it's used for instantaneous speed.
• Speedometer: A speedometer in a vehicle (or similar) shows the speed of the vehicle at the current moment, which is instantaneous speed.
• Stopwatch: A stopwatch is used to measure time intervals, usually for average speed calculations (needing distance over time), not instantaneous speed.
• Measuring Stick: It's used to measure distance, not speed directly, and not for instantaneous speed measurement.

Answer:

A. Radar Gun, D. Speedometer