Define speed. Explain how it is calculated and identify its standard SI unit. Provide a real-life scenario where calculating speed is essential, and describe the steps involved in determining the speed in that scenario.
Speed is defined as the distance covered by an object per unit time. It is calculated by dividing the total distance traveled by the total time taken to cover that distance. Mathematically, speed = . The standard SI unit for speed is meters per second (m/s).
A real-life scenario where calculating speed is essential is determining how fast a car is traveling on a highway. If a car travels a distance of 150 kilometers in 2 hours, we can calculate its average speed. First, we identify the distance (150 km) and the time (2 hours). Then, we apply the formula: Speed = . This calculation helps drivers and traffic authorities monitor vehicle movement and ensure adherence to speed limits for safety.
Explanation
Points will be awarded for:
- Correct definition of speed.
- Correct formula for speed.
- Correct SI unit of speed.
- Relevant real-life example.
- Clear description of steps/calculation in the example.