The position of an object thrown upward from a height of 100 feet/sec from a height of 40 feet is given by: 
Find the rate of change of y with respect to t and evaluate it when t = 1 and t = 4.Interpret your results.
Definitions:
Net Sales
The amount of sales revenue remaining after deducting sales returns, allowances, and discounts.
Units-Of-Production Method
A depreciation method that allocates an asset's cost based on the number of units it produces, linking the depreciation expense to the actual usage of the asset.
Useful Life
The estimated duration of time that an asset is expected to be functional and contribute to a company's operations, used for depreciation calculations.
Depreciation
The systematic allocation of the cost of a tangible asset over its useful life, reflecting wear and tear, decay, or decline in effectiveness.
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