Give reason:

Q. Give reason:
(a) Value of ‘g’ is not constant on earth.
(b) Objects with different masses take same time to fall from a fixed height.
(c) ‘G’ is known as gravitational constant.
Ans. (a) The acceleration due to gravity is given by the expression g = GM / R²
This depends upon the radius of the earth. The radius of earth is not same everywhere, hence 8 is not a constant. Also, g depends upon altitude and depth.
(b) The acceleration due to gravity is given by the expression g = GM/ R² .
This does not depend upon the mass of the body, but depends upon the mass of the planet. Therefore, all bodies fall with the same acceleration. Thus, they take the same time to fall from a fixed height.
(c) This is because G remains same throughout the universe.

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