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

question 45

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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