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Which of the following observations point to the equivalence of inertial and gravitational mass.
  • Two spheres of different masses dropped from the top of a long evacuated tube reach the bottom of the tube at the same time.
  • The time-period of a simple pendulum is independent of its mass.
  • The gravitational force on a particle inside a hollow isolated sphere is zero.
  • For a man in closed cabin that is falling freely under gravity, gravity ‘disappears’.

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