if we have a rock with mass 1,5 kg and one with mass 15 kg which will land first if dropped from the same height?
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you can make these experiment right now 1.-grab a piece fo paper and your keys 2.-throw them from the same altitude to the floor the keys land first right
3.-now grab the paper and make it a small ball 4.- throw them again which land first now ??? these is caused because the paper cut the air and that slow it at first when you make it a ball the paper can't cut the air and go at the same speed than your keys.
these is the same experiment that do Galileo Galilei in the pisa tower