A Rock Is Thrown Vertically into the Air

question 40

Multiple Choice

A rock is thrown vertically into the air.At the very top of its trajectory the net force on it is

• A)less than its weight.
• B)more than its weight.
• C)equal to its weight.

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Definitions:

Growth Rate

The rate at which an organism or population increases in size, often measured as a percentage of increase over a specific period of time.

Death Rate

The ratio of deaths in an area to the population of that area; expressed per 1000 per year.

Birthrate

The number of live births per thousand of population per year.

Biotic Potential

The maximum reproductive capacity of an organism under optimum environmental conditions.