A 25-Kg Block on a Horizontal Surface Is Attached to a Light

question 74

Multiple Choice

A 25-kg block on a horizontal surface is attached to a light spring (force constant = 8.0 kN/m) .The block is pulled 10 cm to the right from its equilibrium position and released from rest.When the block has moved 2.0 cm toward its equilibrium position,its kinetic energy is 12 J.What is the change in mechanical energy caused by the frictional force on the block as it moves the 2.0 cm?

• A)-4.0 J
• B)-3.5 J
• C)-2.4 J
• D)-2.9 J
• E)-15 J

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Definitions:

Dopamine

A neurotransmitter in the brain associated with pleasure, movement, and motivation.

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The basic working units of the brain and nervous system responsible for receiving sensory input, processing information, and transmitting signals.

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Sympathetic Nervous System

A part of the autonomic nervous system that activates the body's fight-or-flight response during perceived threats.