At a given point above the surface of Earth,the gravitational acceleration is equal to 7.8 m/s².The altitude of this point,above the surface of Earth,in km,is closest to:

Question

Quizplus · Accepted Answer

The gravitational acceleration decreases with altitude. Using the formula for gravitational acceleration at a height h: g' = g * (R / (R + h))^2, where g is 9.8 m/s² and R is Earth's radius (~6371 km), solving for h when g' = 7.8 m/s² gives an altitude closest to 770 km.

At a Given Point Above the Surface of Earth,the Gravitational