A stone falls from a ledge and takes 8 seconds to hit the ground. The stone has an original velocity of 0 m/s. How tall is the ledge? A. 313.6 meters B. 78.4 meters C. 1,254.4 meters D. 39.2 meters

Question

Terrence French

Chemistry

23 May, 10:28

A stone falls from a ledge and takes 8 seconds to hit the ground. The stone has an original velocity of 0 m/s. How tall is the ledge? A. 313.6 meters B. 78.4 meters C. 1,254.4 meters D. 39.2 meters

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Lena Gomez · Answer 1

The correct answer is letter A. We use the formula, v=vo + at to get the answer.

v=vo + at

v=0 + (9.8) (8)

v=78.4

y=1/2 (vo + v) t

y=1/2 (78.4) (8)

y=1/2 (627.2)

y=313.6m