Question

Calculate the value of g.

Answer 1

 use the formula: force of gravity = mg, where m is the mass of the object andg is the acceleration of the object due togravity. Since g is always 9.8 m/s^2, just multiply the object's mass by 9.8 and you'll get its force of gravity!

Answer 2

we know, according to Newton's gravitational law ,
$F=\frac{GMm}{r^2}$
here F is force experienced by object m due to earth gravitational field. it is also known as gravitational force. it is equal to weight of body .so , F = mg

hence, $mg=\frac{GMm}{r^2}$

$g=\frac{GM}{r^2}$

here, G is gravitational constant
M is the mass of earth ,
r is the radius of earth.

so, $G=6.67\times10^{-11}Nm^2/Kg^2$
$M=5.972\times10^{24}Kg$
$r=6.4\times10^6m$
after putting it we get, g = 9.8 m/s²

hence, value of g = 9.8 m/s²