Solve
-A Rock Falls from a Tower That Is $160 \mathrm { ft }$

question 179

Multiple Choice

Solve.
-A rock falls from a tower that is $160 \mathrm { ft }$ high. As it is falling, its height is given by the function $h ( t ) = 160 - 16 t ^ { 2 }$ . How many seconds will it take for the rock to hit the ground $( h = 0 )$ ?

• A) \(12.6 \mathrm { sec }\)
• B) \(1600 \mathrm { sec }\)
• C) \(10.2 \mathrm { sec }\)
• D) \(3.2 \mathrm { sec }\)

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Definitions:

Effective Annual Rate

The real return on an investment, taking into account the effect of compounding interest over a year.

Annual Percentage Rate

The annual rate charged for borrowing or earned through an investment, inclusive of any fees or additional costs.

Periodic Interest

Interest that is paid or calculated at regular intervals over the life of a loan or investment.

Stated Interest

The interest rate declared on a bond or loan that represents the actual annual cost of borrowing to the borrower.