Guess my fall!
Number Theory
Level
2
A stone dropped from the 25th storey of a building reach the ground in 5s. Then through how many storeys does it pass in the 1st second of its fall?
1
10
3
2
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1 solution
Height of the 25 storied building(S) = Vit + (1/2)gt^2 = (1/2) * 9.8 * 5 * 5 = 122.5 m
Stone cover a distance in one sec. = (1/2) * 9.8 = 4.9 m
122.5/25 = 4.9 m, is the height of one story
So in 1st sec. stone passes = 1 story