Question

George walks to a friend's house. He walks 750 meters North, then realizes he walked too far. He turns around and walks 250 meters South. The entire walk takes him 13 seconds.

(i) Explain which kind of speed is the most accurate speed to calculate for George's motion out of the following: average speed and instantaneous speed?



Average speed
Instantaneous speed
(ii) Calculate the DISPLACEMENT George made during his movement

500 meters
1000 meters
250 meters
750 meters
(iii) Calculate the Average Speed George had for his entire trip.



38.46 meters per second
58.33 meters per second
45.83 meters per second
40.38 meters per second

Answer 1

Average speed is the most accurate speed to calculate for George's motion. His displacement is 500 meters, and his average speed for the entire trip is 76.92 meters per second.

Step-by-step explanation:

The most accurate speed to calculate for George's motion in this scenario is the average speed. Average speed is calculated by dividing the total distance traveled by the total time taken. It gives the overall rate of motion without considering the specific moments during the trip. The displacement George made during his movement can be calculated as the straight-line distance between his initial and final positions. In this case, George's displacement is 500 meters. To calculate the average speed for George's entire trip, we need to divide the total distance traveled by the total time taken. The total distance traveled in this case is 1000 meters (750 meters North + 250 meters South), and the total time taken is 13 seconds. Therefore, the average speed is 76.92 meters per second.