A 20-Kg Mass Is Projected Vertically Upward from Ground Level with with an Initial

question 36

Multiple Choice

A 2.0-kg mass is projected vertically upward from ground level with an initial speed of 30 m/s. The mass rises to a maximum height of 35 m above ground level. What is the change in mechanical energy of the mass caused by air resistance between the point of projection and the point of maximum height?

• A) −0.21 kJ
• B) −0.47 kJ
• C) −0.40 kJ
• D) −0.34 kJ
• E) −0.69 kJ

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Definitions:

Contribution Margin Ratio

A ratio that represents the percentage of sales revenue that exceeds variable costs, indicating how much revenue contributes towards covering fixed costs and generating profit.

Break-even Point

The sales level at which total revenues equal total costs, resulting in no profit or loss.

Margin of Safety

This metric calculates how much sales can decline before a business reaches its breakeven point.

Total Contribution Margin

The total amount remaining from sales revenue after all variable costs are deducted, used to cover fixed costs and profit.