Final answer:
To convert 2000.0 mm/s to km/hr, we apply two conversion factors to convert millimeters to kilometers and seconds to hours, resulting in 7.2 km/hr, which is option A.
Step-by-step explanation:
The correct answer is option A. 7.2 km/hr. To convert from millimeters per second (mm/s) to kilometers per hour (km/hr), we need to apply two conversion factors: one to convert millimeters to kilometers, and another to convert seconds to hours.
To convert 2000.0 mm/s to km/hr, we need to convert the units from mm/s to km/hr using the given conversion factor.
1 km = 3600 s
First, we convert mm/s to km/s by dividing 2000.0 mm/s by 1000, which gives us 2.0 km/s.
Then, we convert km/s to km/hr by multiplying 2.0 km/s by 3600, which gives us 7200.0 km/hr.
Therefore, 2000.0 mm/s is equal to 7200.0 km/hr.
Here is the step-by-step conversion:
- First, convert millimeters to kilometers: 2000.0 mm × (1 km / 1,000,000 mm) = 0.002 km.
- Then, convert seconds to hours: 1 second × (1 hour / 3600 seconds) = 1/3600 hour.
- Multiply the two results together: 0.002 km/s × 3600 hr = 7.2 km/hr.
Therefore, 2000.0 mm/s is equivalent to 7.2 km/hr, which makes option A the correct choice.