A Flare Fired from the Bottom of a Gorge Is $\left( h ( t ) = - 16 t ^ { 2 } + v 0 t + h 0 . \right)$

question 79

Multiple Choice

A flare fired from the bottom of a gorge is visible only when the flare is above the rim. If it is fired with an initial velocity of 112 ft/sec and the gorge is 160 ft deep, during what interval can the flare be seen?
$\left( h ( t ) = - 16 t ^ { 2 } + v 0 t + h 0 . \right)$

• A) \(6 \sec < \mathrm { t } < 9 \mathrm { sec }\)
• B) \(4 \mathrm { sec } < t < 7 \mathrm { sec }\)
• C) \(2 \mathrm { sec } < t < 5 \mathrm { sec }\)
• D) \(0 \mathrm { sec } < t < 2 \mathrm { sec }\)

---

Definitions:

Polymorphic Reference

A reference variable in object-oriented programming that can refer to objects of different classes at different times during the execution of a program.

Subclasses

Subclasses are classes that inherit properties and behaviors from a superclass and can also have additional properties or methods.

Public Methods

Methods that can be accessed from any other class in the program, not restricted by access control.

Superclass

In object-oriented programming, a superclass is the parent class from which other classes inherit properties and methods.