Solve
-A Rocket Is Launched from the Top of a Cliff

question 140

Multiple Choice

Solve.
-A rocket is launched from the top of a cliff. The height, $\mathrm { s } ( \mathrm { t } )$ , of the rocket after $\mathrm { t }$ seconds is given by the equation $s ( t ) = - 16 t ^ { 2 } + 120 t + 48$ . How long after the rocket is launched will it strike the ground? Round to the nearest tenth of a second, if necessary.

• A) \(9.3 \mathrm { sec }\)
• B) \(7.9 \mathrm { sec }\)
• C) \(8.3 \mathrm { sec }\)
• D) \(8.7 \mathrm { sec }\)

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Definitions:

Farsightedness

A common vision condition where distant objects can be seen clearly, but close ones do not come into proper focus.

Convex Lens

A lens that converges light rays to a point, having a curved shape that is thicker in the middle than at the edges, used to correct farsightedness.

Visual Acuity

The clarity or sharpness of vision, measured as the capability to identify letters or numbers at a standardized distance.

Accommodation

The eye's ability to change its focus from distant to near objects, achieved by changing the lens shape.