NEET-XII-Physics
qstns with ansrs year:2022
- #11The ratio of the distances travelled by a freely falling body in the `` 1^{\text {st }}, 2^{\text {nd }}, 3^{\text {rd }} `` and `` 4^{\text {th }} `` second :
(A) `` 1: 1: 1: 1 ``
(B) `` 1: 2: 3: 4 ``
(C) `` 1: 4: 9: 16 ``
(D) `` 1: 3: 5: 7 ``digAnsr: DAns : `` S _{ nth }= u +\frac{ a }{2}(2 n -1) ``
`` =0+\frac{ a }{2}(2 n -1) ``
`` S _{ nth } \propto(2 n -1) ``
`` \Rightarrow S _{1 st }, S _{2 nd }, S _{3 rd }, S _{4 th } ``
`` =[2(1)-1]:[2(2)-1]:[2(3)-1]:[2(4)-1] ``
`` =1: 3: 5: 7 ``