The value of `g` on the earth's surface is `980 cm//sec^(2)` . Its value at a height of `64` km from the earth's surface is

Options

A. `960.40cm//s^(2)`
B. `984.90cm//s^(2)`
C. `982.45cm//s^(2)`
D. `977.55cm//s^(2)`

Answer

a

Explanation

`g prop (1)/((R+h)^(2))`
`therefore" "(g)/(980)=(R^(2))/((R+h)^(2))`
`therefore" "g=960cm//s^(2)`