Question

at a height,h from the earth's surface,the acceleration due to gravity,g=1/2*acceleration due to gravity at the surface,g.find h

Answer 1

If g is reduced half , g' = 1/2 g
Then,
g/2= g [1-2h/R]
=> R = 2R - 4h
=>4h = 2R - R
=> h = R/4
=> h = 6400/4
=> h = 1600 km