A wrecking ball hanging motionless at the top of its swing holds:
AAll potential, no kinetic
BAll kinetic, no potential
CHalf kinetic, half potential
DNeither kinetic nor potential
Answer & Solution
Correct answer: A. All potential, no kinetic
1. Potential energy is the energy of position, kinetic energy the energy of motion.
2. A ball that is not moving has no motion to account for.
3. As the wrecking ball hangs motionless, it has 0 kinetic and 100 percent potential energy.
4. Somewhere mid-fall it has 50 percent kinetic and 50 percent potential energy, which is the trap option here.
_Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 6 'Metabolism', sections 6.1-6.5_
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