67th B.P.S.C. (Pre) 2022
If a feather, a rubber ball and a wooden ball are falling freely simultaneously from the same height in the vacuum then
aThe feather will reach the ground first
bThe rubber ball will reach the ground first
cThe wooden ball will reach the ground first
dAll three will reach the ground together✓ Correct
eNone of the above / More than one of the above
Explanation
In vacuum, air resistance is zero. Therefore, if a feather, a rubber ball and a wooden ball are dropped freely together from the same height, all three will reach the ground at the same time, because their final velocity ($v = \sqrt{2gh}$) will be independent of their masses.
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