Final answer:
The average speed of the car for the total trip is 7.27 miles per hour, obtained by converting the total distance of 65.0 meters and total time of 20.0 seconds into meters per second and then using the conversion factor to get miles per hour.
Step-by-step explanation:
To calculate the average speed of the car in miles per hour for the total trip, you first need to find the total distance traveled and the total time taken. The car travels 25.0 meters in the first 10.0 seconds and 40.0 meters in the next 10.0 seconds, giving us a total distance traveled of 25.0 meters + 40.0 meters = 65.0 meters. The total time taken is 10.0 seconds + 10.0 seconds = 20.0 seconds.
To find the average speed in meters per second (m/s), you divide the total distance by the total time:
Total distance = 65.0 meters
Total time = 20.0 seconds
Average speed in m/s = Total distance / Total time = 65.0 meters / 20.0 seconds = 3.25 m/s
However, the question asks for the average speed in miles per hour (mi/h). To convert from meters per second to miles per hour, we use the conversion factor 1 m/s = 2.237 mi/h. Therefore:
Average speed in mi/h = 3.25 m/s * 2.237 mi/h = 7.27 mi/h (rounded to two decimal places)
The average speed of the car for the total trip is 7.27 miles per hour.