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What invisible force holds you onto the earth, so that you don't simply fall off?

  • A.Gravity
  • B.Magnetism
  • C.Wind
  • D.Speed

Answer: A

Gravity holds you to the earth - the mutual attraction between any two masses.

At the surface it gives everything an acceleration of about 9.8 m/s² towards the centre, and your weight is simply that acceleration multiplied by your mass.

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