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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