A 20-Kg Mass Is Projected from the Edge of the Top

question 3

Multiple Choice

A 2.0-kg mass is projected from the edge of the top of a 20-m tall building with a velocity of 24 m/s at some unknown angle above the horizontal. Disregard air resistance and assume the ground is level. What is the kinetic energy of the mass just before it strikes the ground?

• A) 0.18 kJ
• B) 0.97 kJ
• C) 0.89 kJ
• D) 0.26 kJ
• E) 0.40 kJ

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Definitions:

Scolex

The head region of a tapeworm, containing suckers or hooks for attaching to the host's intestinal wall.

Nematocyst

A specialized cell in the tentacles of a jellyfish or other cnidarians, containing a barbed or venomous coiled thread that can be projected in self-defense or to capture prey.

Ascaris

A genus of parasitic nematode worms which can cause the infection ascariasis in humans through ingestion of eggs from contaminated sources.

Roundworm

Invertebrates with nonsegmented cylindrical body covered by a cuticle that molts; some forms are free-living in water and soil, and many are parasitic.