GK
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A 10-g guava freely falling from a tree has a speed of 19.6 m/s. If its total mechanical energy is 10 J, how much gravitational potential energy does the guava have?
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8.08 J
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1920.8 J
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1910.8 J
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0 J
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Explanation:
Detailed explanation-1: -The law of conservation of energy states that energy can neither be created nor destroyed-only converted from one form of energy to another. This means that a system always has the same amount of energy, unless it’s added from the outside.
Detailed explanation-2: -The potential energy of the body decreases as it falls, but the kinetic energy increases. Hence, the total energy (sum of kinetic energy+potential energy) remains constant.
Detailed explanation-3: –The sum of kinetic and potential energy is known as mechanical energy.
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