alleryStart learning →A wrecking ball hangs motionless two storeys above a car. What energy does it have?
AAll kinetic and no potential energy
BEqual parts kinetic and potential energy
CAll potential and no kinetic energy
DNeither kinetic nor potential energy
Answer & Solution
Correct answer: C. All potential and no kinetic energy
1. Kinetic energy is the energy associated with objects in motion, and a hanging ball is not moving.
2. As the wrecking ball hangs motionless, it has 0 kinetic and 100 percent potential energy.
3. Its potential energy comes from the fact that it would do work if released.
4. Somewhere mid-fall it has 50 percent kinetic and 50 percent potential, which is the state the second option describes.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 6 "Metabolism", section 6.2 Potential, Kinetic, Free, and Activation Energy_
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