A 12-Kg Projectile Is Launched with an Initial Vertical Speed

question 57

Multiple Choice

A 12-kg projectile is launched with an initial vertical speed of 20 m/s.It rises to a maximum height of 18 m above the launch point.What is the change in mechanical energy caused by the dissipative (air) resistive force on the projectile during this ascent?

• A)-0.64 kJ
• B)-0.40 kJ
• C)-0.52 kJ
• D)-0.28 kJ
• E)-0.76 kJ

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Definitions:

Observation Motivation

Observation motivation is the drive or inclination to learn or acquire new behaviors, skills, or information by observing others rather than through direct experience.

Foot-In-The-Door Effect

A mental phenomenon wherein consenting to a minor request enhances the chances of acquiescing to a more significant request subsequently.

Low Balling

A persuasion technique often used in sales where an initially low price is presented to secure agreement from the buyer, only to increase the cost through the addition of extras or disclosure of hidden costs.

Social Conformity

The act of adjusting one's thoughts or behaviors in order to fit in with the norms or standards of a social group or society.