To calculate average speed, you divide the total distance traveled by the total time it took to travel that distance. In this case, the total distance is 80km + 50km = 130km and the total time is (80km/100 km/h) + (50km/75 km/h) = 0.8 hours + 0.67 hours = 1.47 hours. Therefore, the average speed is 130km/1.47 hours = 88.4 km/h.
Average speed is important because it gives us an overall understanding of how fast an object is moving over a certain distance. It allows us to compare the speeds of different objects and determine which one is faster or slower.
Speed refers to the rate at which an object is moving at a specific moment in time, while average speed is the overall rate at which an object has moved over a certain distance. Speed can vary, while average speed remains constant over the entire distance traveled.
No, average speed cannot be negative. Speed is a scalar quantity, meaning it only has magnitude (size) and no direction. Therefore, it cannot have a negative value. If an object is moving in the opposite direction, its speed would be represented by a negative value, but average speed would still be positive.
The standard units used to measure speed are distance per time, such as km/h (kilometers per hour), m/s (meters per second), or mph (miles per hour). However, other units like feet per second or kilometers per minute can also be used.