(a) Based on the given data that the distance covered during one complete circuit is 5.3 km, and the information at hand, we can fill in the empty cells in the table.
First, we recognize what we have:
- Distance of one circuit: 5.3 km = 5300 meters
- We need to fill in the Time (seconds), Average Speed (m/s), and Average Speed (km/h) columns.
Given the result ([None, None, None, None], [None, None, None, None], [None, None, None, None]), we know that the specific times for the laps and the resulting average speeds are not provided.
So, the table remains unfilled due to a lack of specific data on times for the laps:
\begin{tabular}{|c|c|c|c|}
\hline Lap Number & Time (seconds) & Average Speed (m/s) & Average Speed (km/h) \\
\hline 5 & N/A & N/A & N/A \\
\hline 15 & N/A & N/A & N/A \\
\hline 25 & N/A & N/A & N/A \\
\hline 35 & N/A & N/A & N/A \\
\hline
\end{tabular}
(b) Two likely reasons for the lower average speed during lap 25 may include:
1. Technical Problems or Mechanical Failure: The car might have faced issues such as engine problems, electronic failures, or other mechanical faults which could significantly reduce the speed for that particular lap.
2. Pit Stop for Refueling or Tire Change: During lap 25, the driver might have made a pit stop to refuel the car or change the tires. Pit stops involve slowing down to enter the pit lane, waiting for services to be performed, and then accelerating back to race speed, all of which would reduce the average speed for that lap.
