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If the mass of the body on the surface of the earth is \( 50 k g, \) its mass at the centre of the earth is:

1. zero
2. More than \( 50 \mathrm{kg} \)
3. Less than \( 50 \mathrm{kg} \)
4. Equal to \( 50 \mathrm{kg} \)

Correct answer: zero

Solution

The correct physics idea is that mass is invariant, while weight depends on gravitational field strength. At the Earth’s center, the gravitational field is zero, so the body’s weight becomes zero, not its mass.

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