how in a vacuum everything falls at the same time give a really short answer
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regardless of size or shape or weight, free fall with the same acceleration. In a vacuum, a beach ball falls at the same rate as an airliner. ... The remarkable observation that all free falling objects fall with the same acceleration was first proposed by Galileo Galilei nearly 400 years ago.
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a force acting on the body is given by F=r2GMm
here m is different for different bodies hence force acting on different bodies will be different.
acceleration is massforce=r2GM, this is independent of the mass of the body or type of the body.
also, speed or velocity depends on time for which it is accelerated because acceleration is the same.
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