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Q.

A stone is dropped from the top of a multistoryed building. If it crosses 2 floors in the first second of its free fall, the number of floors it can cross in 4th second of its fall is

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a

7

b

4

c

12

d

14

answer is D.

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Detailed Solution

12g(2×1−1)=2 12g(8−1)=x Solving x = 14

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