A 0.04-kg ball is thrown from the top of a 30-m tall building (point A) at an unknown angle above the horizontal. As shown in the figure, the ball attains a maximum height of 10 m above the top of the building before striking the ground at point B. If air resistance is negligible, what is the value of the kinetic energy of the ball at B minus the kinetic energy of the ball at A (KB − KA) ? 
Definitions:
Laffer Curve
A representation of the relationship between rates of taxation and the resulting levels of government revenue that illustrates there can be an optimum tax rate that maximizes revenue.
Tax Revenues
The income that is collected by governments through taxation.
Progressive Tax
A tax in which the average tax rate rises with income. People with higher incomes will pay a higher percentage of their income in taxes.
Proportional Tax
A tax in which the average tax rate is the same at all income levels. Everyone pays the same percentage of income in taxes.
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