The ratios of the distances covered by a freely falling particle, starting from rest, in the first, second, third.... nth seconds of its motion
A
form an arithmetic progression
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B
form the series corresponding to the squares of the first n natural numbers
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C
do not form any well-defined series
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D
form a series corresponding to the differences of the squares of the successive whole numbers
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Solution
The correct options are A form an arithmetic progression D form a series corresponding to the differences of the squares of the successive whole numbers Distance covered in t=1s, u=0 (Initial velocity is 0 during free fall) h1=12×g×(1)2=12g (Using second equation of motion) Distance covered in t=2s, h2=12×g(2)2=2g Distance covered in t=3s, h3=12×g(3)2=92g Distance covered in t=4s, h4=8g In 2nd second distance covered =h2−h1=2g−12g=32g In 3rd second distance covered =h3−h2=92g−2g=52g ∴ Ratio of distance covered in successive seconds is 1:3:5:7:9 As there is a common difference between all the successive terms, so it is an A.P. We can also write the following ratios like 12:22−12:32−22:42−32 Thus, it forms a series corresponding to the differences of the squares of the successive whole numbers.