The speed needed to escape the pull of Earth's gravity is 11.3 km/s. What is this speed in mi/h? A) 65,500 mi/h B) 25,300 mi/h C) 18,200 mi/h D) 1,090 mi/h E) 5.02 × 10^-3 mi/h

Question

Quizplus · Accepted Answer

We can use the conversion factors: 
1 km = 0.621371 mi 
1 hour = 3600 seconds

11.3 km/s = (11.3 km/s)(0.621371 mi/km)(3600 s/h) = 25,303 mi/h

Therefore, the answer is B) 25,300 mi/h (rounded to the nearest hundred).

The Speed Needed to Escape the Pull of Earth's Gravity