Solve the Problem
-A Rock Is Propelled Upward from the Top

question 206

Multiple Choice

Solve the problem
-A rock is propelled upward from the top of a building 210 feet tall at an initial velocity of 176 feet per second. The function that describes the height of the rocket in terms of time $t$ is $s ( t ) = - 16 t ^ { 2 } + 176 t + 210$ . Determine the time at which the rock reaches its maximum height.

• A) \(4.4 \mathrm { sec }\)
• B) \(5.5 \mathrm { sec }\)
• C) \(11 \mathrm { sec }\)
• D) \(8.8 \mathrm { sec }\)

---

Definitions:

Gibberellin

Plant hormone promoting increased stem growth; also involved in flowering and seed germination.

Phytochrome

Photoreversible plant pigment that is involved in photoperiodism and other responses of plants, such as etiolation.

Cytokinins

Plant hormones that promote cell division and growth, delay the aging of leaves, and in conjunction with other hormones, regulate plant development.

Auxin

Plant hormone regulating growth, particularly cell elongation; also called indoleacetic acid (IAA).