Final answer:
The average speed of the car for the total trip is found by dividing the total distance of 75.0 meters by the total time of 20.0 seconds, resulting in an average speed of 3.75 meters per second (m/s).
option b is the correct
Step-by-step explanation:
To calculate the average speed of the car for the total trip, we first need to find the total distance traveled and the total time taken. The car travels 30.0 meters in the first 10.0 seconds and 45.0 meters in the next 10.0 seconds. So, the total distance covered is 30.0 meters + 45.0 meters = 75.0 meters. The total time taken is 10.0 seconds + 10.0 seconds = 20.0 seconds.
To find the average speed, we divide the total distance by the total time taken. Average speed = Total distance / Total time = 75.0 meters / 20.0 seconds = 3.75 meters per second (m/s). This is option (b).
To convert this speed into miles per hour, we can use the conversion factor where 1 m/s is approximately equal to 2.2 miles per hour (mi/h). So, 3.75 m/s * 2.2 mi/h per 1 m/s = 8.25 miles per hour (mi/h). However, the question asked for the result in meters per second, so the answer would still be 3.75 m/s.