If the odometer on the car reads 25.0 km at the beginning of a trip and 65.0 km a half hour later, what is the average speed of the car? (Remember significant digits.)
80 km/h
To find the average speed of a car, you need to divide the total distance traveled by the total time taken. In this case, the total distance traveled is the difference between the final and initial odometer readings, which is 65.0 km - 25.0 km = 40.0 km.
The total time taken is given as half an hour, which needs to be converted to hours. Since there are 60 minutes in an hour, half an hour is equal to 0.5 hours.
Now we can divide the total distance traveled by the total time taken to find the average speed:
Average speed = Total distance / Total time
= 40.0 km / 0.5 hours
= 80.0 km/h
Therefore, the average speed of the car is 80.0 km/h.