Final answer:
The car traveling at 50 km/h for 20 seconds covers approximately 0.27778 kilometers, which means that none of the provided options (A, B, C, D) are correct.
This correct answer is none of the above.
Step-by-step explanation:
The student's question is about converting a car's speed from kilometers per hour to the distance traveled within a specific time frame, specifically 20 seconds. To find the distance traveled by a car moving at 50 km/h in 20 seconds, perform the following steps:
- First, convert the speed from km/h to meters per second (m/s) using the conversion factor where 1 km/h = 0.27778 m/s. This gives us 50 km/h × 0.27778 m/s/km/h = 13.889 m/s.
- Next, multiply the speed in m/s by the time in seconds to find the distance traveled: 13.889 m/s × 20 s = 277.78 meters.
- Finally, convert meters to kilometers by dividing by 1000: 277.78 m / 1000 = 0.27778 km.
Therefore, the car travels approximately 0.27778 kilometers in 20 seconds. This means that the correct answer to the student's question is that the car does not travel 1 km, so none of the provided options A) 1 km, B) 2 km, C) 3 km, or D) 4 km are correct.
This correct answer is none of the above.