In a relay race, each contestant runs a distance 25.7m while carrying an egg balanced on a spoon, turns around, and comes back to the starting point. Jenny runs the first distance 25.7m in a time t1 = 20.0s . On the return trip she is more confident and takes only time t2 = 14.5s .
Is there a question here?
To find Jenny's average speed for the entire race, we need to calculate the total distance covered and the total time taken.
First, let's calculate the total distance covered by Jenny during the race. Since she runs a distance of 25.7m and then returns to the starting point, the total distance covered by Jenny is:
Total Distance = Distance Out + Distance Back
Total Distance = 25.7m + 25.7m = 51.4m
Next, let's calculate the total time taken by Jenny during the race. Since we know Jenny's time for the first distance is t1 = 20.0s and for the return trip is t2 = 14.5s, the total time taken by Jenny is:
Total Time = Time Out + Time Back
Total Time = t1 + t2 = 20.0s + 14.5s = 34.5s
Now that we have the total distance and the total time, we can calculate the average speed using the formula:
Average Speed = Total Distance / Total Time
Average Speed = 51.4m / 34.5s
Calculating, we get:
Average Speed ≈ 1.49 m/s
Therefore, Jenny's average speed for the entire race is approximately 1.49 m/s.