I. Calculating Speed A. Speed speed is the change in distance over time, or simply: speed=distance/time 1. unit of speed=unit of distance/unit of time examples: miles/hour, meters/second, kilometers/hour B. Distance distance=speed x time C. Time time=distance/speed II. Examples Ex1: A football field is about 100 m long. If it takes a person 20 seconds to run its length, how fast (what average speed) were they running? 5 m/s Ex2: The pitcher’s mound in baseball is 85 m from the plate. It takes 4 seconds for a pitch to reach the plate. How fast is the pitch? 21.25 m/s Ex3: If you drive at an average speed of 100 km/hr for 6 hours, how far will you go? 600 km Ex4: If you run at 12 m/s for 15 seconds, how far will you go? 180 m Ex5: Every summer I drive to Michigan. It is 3900 km to get there. If I average 100 km/hr, how much time will I spend driving? 39 hoursEx6: A bullet travels at 850 m/s. How long will it take a bullet to go 1000 m? 1.18 s Attachments Calculating Speed, Time, and Distance - Worksheet for practice with speed, time and distance |
