Ca7ndialverer Ca7ndialverer

08-08-2016
Mathematics

Answered

How tall is a building if a stone dropped from its top in free-fall strikes the ground with a velocity of 40 m/s? assume that the original velocity is zero.

A78.2 m
B80.4 m
C79.8 m
D81.6 m

Verified Answer :

Edufirst Edufirst

21-08-2016

Vf = Vo + gt

Vo = 0

Vf = gt ==> t = Vf/g = 40m/s/9.8m/s^2 = 4.08 s

H = y - yo = Vot + 1/2 gt^2

H = 1/2 (9.8 m/s^2) (4.08s)^2 = 81.6 m

Answer: option d: 81.6 m

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