A Rock Is Dropped from the Top of a Vertical

question 34

Multiple Choice

A rock is dropped from the top of a vertical cliff and takes 3.00 s to reach the ground below the cliff. A second rock is thrown vertically from the cliff, and it takes this rock 2.00 s to reach the ground below the cliff from the time it is released. With what velocity was the second rock thrown, assuming no air resistance?

• A) 4.76 m/s upward
• B) 5.51 m/s downward
• C) 12.3 m/s upward
• D) 4.76 m/s downward
• E) 12.3 m/s downward

---

Definitions:

Economies of Scale

The cost advantage that arises with increased output of a product, where the average cost per unit decreases as scale of production increases.

Barriers to Entry

Factors that prevent or hinder companies from entering a specific market, such as high startup costs or stringent regulations.

Profit-Maximizing

a strategy or process where a firm determines the price, output level, and production scale that lead to the highest possible profit, under certain market conditions.

Profit

The profit achieved when the revenue from business operations surpasses the combined total of expenses, costs, and taxes needed to maintain those operations.