A 05-Kg Model Helicopter Initially at Rest on the Ground,starts to to Move

question 58

Multiple Choice

A 0.5-kg model helicopter initially at rest on the ground,starts to move directly up under the effect of a lift force of magnitude of 7.4 N.After 12 seconds the engine stops and the helicopter starts free fall.Ignoring air resistance,calculate the helicopter's velocity just as the engine stops.

• A)59.9 m/s
• B)178 m/s
• C)48.4 m/s
• D)38.0 m/s
• E)118 m/s

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Definitions:

Contribution Margin Ratio

The percentage of each sale that remains after variable costs are deducted, indicating how much revenue is contributing to fixed costs and profit.

Operating Leverage

A measure of how sensitive a company's operating income is to a change in sales, reflecting the proportion of fixed costs in the company's cost structure.

Break-even Point

The point where the amount of goods produced or sold matches the total expenses, leading to neither a profit nor a loss.

Contribution Margin

The difference between sales revenue and variable costs, used to cover fixed costs and to generate profit.