A 20-Kg Mass Is Projected Vertically Upward from Ground Level with with an Initial

question 36

Multiple Choice

A 2.0-kg mass is projected vertically upward from ground level with an initial speed of 30 m/s. The mass rises to a maximum height of 35 m above ground level. What is the change in mechanical energy of the mass caused by air resistance between the point of projection and the point of maximum height?

• A) −0.21 kJ
• B) −0.47 kJ
• C) −0.40 kJ
• D) −0.34 kJ
• E) −0.69 kJ

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Definitions:

Therapeutic Community

A structured environment where individuals support one another in recovery or rehabilitation, using the community itself as a key agent of change.

Core Concept

A fundamental idea or principle that serves as the foundation for a system, theory, or belief.

Bystander Effect

A social psychological phenomenon where individuals are less likely to offer help to a victim when other people are present, often due to a diffusion of responsibility.

Emergency Situation

An unexpected and often dangerous situation that requires immediate action.