1. Using Distance and Time:
* Formula: Speed = Distance / Time
* Example: If a car travels 100 miles in 2 hours, its speed is 100 miles / 2 hours = 50 miles per hour.
2. Using Velocity:
* Formula: Speed = |Velocity|
* Example: If an object's velocity is 20 m/s to the east, its speed is 20 m/s. (Velocity is a vector quantity, meaning it has both magnitude and direction. Speed is the magnitude of the velocity.)
3. Using Acceleration and Time:
* Formula: Speed = Initial Speed + (Acceleration x Time)
* Example: If a car starts from rest (initial speed = 0) and accelerates at 5 m/s² for 10 seconds, its final speed is 0 + (5 m/s² x 10 s) = 50 m/s.
4. Using Other Measurements:
* Speedometer: This device directly measures the speed of a vehicle.
* Radar gun: This device measures the speed of an object using electromagnetic waves.
* Chronograph: This device measures the time it takes for an object to travel a certain distance.
Important Note: It's crucial to understand that speed is a scalar quantity, meaning it only tells you how fast something is moving. To describe the direction of motion, you need to use velocity.
