Question

what is the weight of the body of mass m at the centre of Earth

Answer 1

it will be zero
hope it helps u

Answer 2

The weight of the body will be zero. since the gravitational force at the center of the earth is zero. weight is the force with which earth attracts us. so,

force with which earth attracts us= mass x acceleration 

= mass x acceleration due to gravity
= mass x 0 (since the acceleration of gravity at  the center of the earth is zero)
=0 N


∴the weight at the center of the earth is 0 N