If a car completes a 3.8 mi oval track in 69.7 s, what is the average speed? answer in mph
Did the car accelerate? (A.yes the direction of the motion changed or B. yes the speed changed or C. no the speed didn't change)
The average speed is 3.8/69.7 = 0.054519 miles per second. Multiply that by 3600 sec/hr for mph.
I get 196.3 mph
Yes of course the cart had to accelerate on the turns. That does not mean the speed had to change (although it probably did)
To find the average speed, we need to divide the total distance traveled by the total time taken.
In this case, the car completes a 3.8-mile oval track in 69.7 seconds.
Average speed = Total distance / Total time
Average speed = 3.8 miles / 69.7 seconds
Now, we need to convert the time from seconds to hours because average speed is typically expressed in miles per hour (mph).
To convert seconds to hours, we divide the time in seconds by 3600 (the number of seconds in an hour).
69.7 seconds / 3600 seconds/hour = 0.0194 hours
Average speed = 3.8 miles / 0.0194 hours
Calculating this gives us:
Average speed ≈ 195.87 mph
Therefore, the average speed of the car is approximately 195.87 mph.
Now, to determine if the car accelerated, we need to consider if the direction or speed changed.
Here, the direction didn't change since the car completed the track in the same direction. However, we cannot determine if the speed changed based on the given information.
So, the correct answer is C. no, the speed didn't change.
To find the average speed, we can divide the total distance traveled by the time it took to cover that distance.
The given total distance is 3.8 miles, and the time taken is 69.7 seconds.
To convert the time from seconds to hours, we need to divide by 3600 (since there are 60 seconds in a minute and 60 minutes in an hour).
So, 69.7 seconds ÷ 3600 = 0.0194 hours (rounded to four decimal places).
Now, we can calculate the average speed by dividing the total distance by the time:
Average speed = Total distance ÷ Time
Average speed = 3.8 miles ÷ 0.0194 hours
Using simple division, we can calculate the average speed:
Average speed ≈ 196.907 mph (rounded to three decimal places).
Therefore, the average speed of the car is approximately 196.907 mph.
To determine if the car accelerated, we need to analyze if there was a change in the speed during the motion.