Answer:
The weight of a person can become zero under the following conditions: (i) When the person is at the centre of the earth (as \[g\text{ }=0\]at the centre of the earth). (ii) When the person is at the null points in space (At these points, the gravitational forces due to different masses cancel out). (iii) When the person is standing in a freely falling lift. (iv) When the person is inside a spacecraft which is orbiting around the earth.
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