A quick conception question Newtonian physics

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Acceleration due to gravity is constant at approximately 9.81 m/s² for all objects, regardless of their mass, when air resistance is negligible. Both a stone weighing 1000 kg and a ball weighing 1 kg will experience the same acceleration when thrown upwards with the same initial speed. The argument that a lighter object would have greater acceleration is incorrect. This principle is a fundamental aspect of Newtonian physics. Therefore, the acceleration remains the same for both objects in a vacuum.
quantumtron
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i was having an argument with my friend.

He claims that acceleration for object that is lighter, let say a stone (1000kg) and ball (1kg). If we were to throw them up in the sky with the same initial speed, their acceleration would always be 9.81ms^2 (depending on sign conventions). Am i right to say that?

My friend claims that the acceleration for the lighter object would be greater...
 
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You're right. Your friend is wrong (assuming we're neglecting wind resistance).
 

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