Question

(1) Mass of a book is 500g on the surface of the earth . what will be its mass at a height equal to radius of earth
(2) find the weight of the book at the surface of the earth

Answer 1

(1) Mass is the quantity of matter present in it. So, mass at a height equal to surface of earth will remains the same i.e. $500g$

(2) Mass, $m=500Kg=0.5g$

Weight,

$w=mg$

$w=0.5\times 10$

$w=5N$