A stone falls freely such that the distance covered by it in the last second of its motion is equal to the distance covered by it in the first 5 secon

Question

A stone falls freely such that the distance covered by it in the last second of its motion is equal to the distance covered by it in the first 5 secon

A stone falls freely such that the distance covered by it in the last second of its motion is equal to the distance covered by it in the first 5 seconds. It remained in air for :-
A. 12s
B. 13s
C. 25s
D. 26s

Monjur Alahi

4 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Correct Answer - B
Let total time of fall =n,u=0
`S_("last")=S_(5)`
`(g)/(2)(2n-1)=(1)/(2)g(5)^(2)`
`2n-1=25 rArr t=13 sec`

4 views Answered 2023-02-05 15:29