Free Fall: a Ball Is Projected Upward at Time T

question 19

Multiple Choice

Free fall: A ball is projected upward at time t = 0.0 s, from a point on a roof 90 m above the ground. The ball rises, then falls and strikes the ground. The initial velocity of the ball is if air resistance is negligible. The time when the ball strikes the ground is closest to

• A) 9.4 s
• B) 9.0 s
• C) 8.7 s
• D) 9.7 s
• E) 10 s

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Definitions:

Mixed Costs

Expenses comprising both fixed and variable components, changing in total with the level of activity but not proportionately.

Merchandising Firm

A business that purchases finished goods for resale in order to make a profit, differentiating itself from manufacturing firms and service firms.

Gross Margin

The difference between sales revenue and the cost of goods sold, expressed as a percentage of sales revenue.

Contribution Margin

The amount remaining from sales revenue after variable expenses have been deducted; a measure of profitability.