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The Earth's Gravitational constant is 9.8 meters per second. All objects of any mass fall at the same rate, neglecting air friction. The Equation for calculating the time it takes for an object to fall is

t(time) d(Distance) g(Earth's Gravitational Constant)

35000 feet is 10668 meters

T= (2d/g)^1/2

T=(2(10668)/(9.8)^1/2

T=(21336)/(9.8)^1/2

T=2177^1/2

T=46.6 seconds

A plane falling from 35,000 ft will take about 46.6 seconds to hit the ground. this is the same for anything.

However, in the real world, we can't neglect air friction, so the actual time to fall will always be longer than 46.6 seconds. The air friction has to do with the overall size and shape of the falling object, but not specifically its weight.

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