Why will a sheet of paper fall slower than one that is crumpled into a ball ?

Question.
Why will a sheet of paper fall slower than one that is crumpled into a ball ?

Solution:
Sheet crumpled into a ball has small surface area as compared to the similar unfolded sheet. Therefore, unfolded sheet will experience more resistance due to air as compared to the sheet crumpled into a ball, inspite of same force of gravity acting upon them. It is larger resistance of air which slows down the unfolded sheet, and therefore it falls slower as compared to sheet crumpled into a ball.

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