Two Blocks Are at Rest on a Horizontal Frictionless Surface

question 31

Multiple Choice

Two blocks are at rest on a horizontal frictionless surface with a compressed spring between them.The 5.0-kg block accelerates when the string holding the system in compression is cut and the 10-kg box accelerates in the opposite direction.What is the magnitude of the force from the expanding spring on the 10-kg box when the 5.0-kg box is undergoing an acceleration of 9.0 m/s²?

• A) 22.5 N
• B) 90 N
• C) 135 N
• D) 45 N
• E) ​0 N

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Definitions:

Competitive Price-searcher

A market structure where firms have some degree of market power, allowing them to set prices above marginal cost to seek profits, while still facing competition.

Average Total Cost

The total cost of production divided by the quantity produced, representing the cost per unit of output.

Contestable Market

A market with free entry and exit, where a company's prices and outputs are constrained by the threat of competition from potential entrants.

Economic Profit

The offset between total financial inflow and all encompassing outgoings, covering both specified and unspecified expenses.