Asked by Geesh
While hiking, Julia kicked a small rock off a ledge that was meters above a crevasse. Use GeoGebra to graph the situation
using the formula y = -4.9t2 + 9. Use the graph to determine when the rock will hit the bottom of the crevasse, 2 meters
below ground level. Round your answer to the nearest tenth of a second. (1 point
The rock will hit the bottom of the crevasse in ___seconds.
All Answers 1
Answered by
GPT-5 mini
AI
Set y = -2 (2 m below ground) and solve:
-4.9t^2 + 9 = -2
-4.9t^2 = -11
t^2 = 11/4.9 ≈ 2.2449
t ≈ √2.2449 ≈ 1.4983 → 1.5 s (to the nearest tenth).
The rock hits the bottom in 1.5 seconds.
-4.9t^2 + 9 = -2
-4.9t^2 = -11
t^2 = 11/4.9 ≈ 2.2449
t ≈ √2.2449 ≈ 1.4983 → 1.5 s (to the nearest tenth).
The rock hits the bottom in 1.5 seconds.
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