Identical balls are dropped from sufficient height on a regular interval of t second. Distance between 1st and 2nd ball when the nth ball is dropped is ?
Answer is 1/2gt2(2n-3)

Dear student
let the first ball is dropped at t=0 then first  ball takes time of (n-1)t  and second ball takes time (n-2)tnow s1 =12g{ (n-1)t}2    and s2  =12g{ (n-2)t}2   now seperation between them  is s1 -s2=12g{ (n-1)t}2 -12g{ (n-2)t}2=12gt2(2n-3)Regards

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