A body falls freely from rest. It c...
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A body falls freely from rest. It covers as much distance in the last second of its motion as covered in the first three seconds. The body has fallen for a time of: (A) 3 s (B) 5s (C) 7 s (D) 9 s natorat

NEET/Medical Exams
Physics
Solution
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( S_{n+h}=u+frac{a}{2}(2 n-1) ) ( S_{n}=0+frac{-9}{2}(2 n-1) ) ( S_{3-0}=0+frac{1}{2}(-9)(3)^{2} ) ( 2^{2}=frac{9}{2}(2 n-1) ) ( 2^{2}=2 n-1 ) ( 2 n=9+1 ) ( n=5 s )
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