Answer:
1. C. The change is easily reversible
2. A. a physical change
Explanation:
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The kinetic energy is the same as the potential energy of raising it 40cm (0.4m). That's mgh where m is mass of ball. Its then 3.924*m, whatever m is equal to in kg.
The Doppler effect occurs when a source of sound or light
moves either toward or away from the observer.
