Question

discuss at which condition that a coin and a feather fall on earth with same speed will they fall on earth with same speed everytime

Answer 1

this if because acceleration gravity is equal on both wherever they are present,i.e. , if they are on earth the acceleration due to gravity for free fall of an object will be 9.8m/s² or 10m/s² and on moon 1.63m/s².

Answer 2

a room where no vacuum present it mean no air is present than ,the coin and feather fall on earth with same speed will they fall on earth with same speed everytime.