A 10 g penny is dropped from a building that is 125m high. The penny is initially at rest. Approximately how many seconds does it take the penny to hit the ground?

A) 3.2 B) 4.5 C) 10 D) 15 E) 20

Question

Mathematics

Nehemiah Carroll

6 August, 20:37

A 10 g penny is dropped from a building that is 125m high. The penny is initially at rest. Approximately how many seconds does it take the penny to hit the ground?

A) 3.2 B) 4.5 C) 10 D) 15 E) 20

+4

Answers (1)

Know the Answer?

Anya · Answer 1

H = 125 m; v o = 0 m/s; g = 9.81 m/s²;

h = v o · t + g t² / 2

125 = 9.81 · t² / 2

t = √ (250 : 9.81)

t = 5.048 s

Answer:

The closest is B) 4.5 seconds

A 10 g penny is dropped from a building that is 125m high. The penny is initially at rest. Approximately how many seconds does it take the penny to hit the ground?A) 3.2 B) 4.5 C) 10 D) 15 E) 20

A 10 g penny is dropped from a building that is 125m high. The penny is initially at rest. Approximately how many seconds does it take the penny to hit the ground?

A) 3.2 B) 4.5 C) 10 D) 15 E) 20