A 400 Kg Object Is Moving at 5

question 25

Multiple Choice

A 4.00 kg object is moving at 5.00 m/s WEST. It catches up to and strikes a 6.00 kg that is moving WEST at 2.00 m/s. The objects undergo an elastic collision and move away in the EAST-WEST direction. The velocity of the 6.00 kg object after the collision is

• A) 1.40 m/s WEST.
• B) 1.40 m/s EAST.
• C) 4.40 m/s EAST.
• D) 4.40 m/s WEST.
• E) 3.00 m/s WEST.

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Definitions:

Existential Generalization

A logical inference rule stating that if an assertion is true for some member of a domain, then there exists an element in that domain for which the assertion holds.

Universal Generalization

A logical principle stating that what is true of all instances of a certain class can be said to be generally true of that class.

Existential Instantiation

A logical principle allowing for the inference of the existence of an instance of a predicate from a statement asserting the existence of some (possibly unspecified) instance.

Universal Instantiation

A logical rule stating that if something is true for everything in a certain category, it is true for each specific member of that category.