SCIENCE
PHYSICAL SCIENCES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A motorbike moving at a speed v, has a kinetic energy E. If the speed of the motorbike increases to 3v, the kinetic energy will be ____
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3E
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⅓E
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6E
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9E
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Explanation:
Detailed explanation-1: -For a threefold increase in speed, the kinetic energy will increase by a factor of nine.
Detailed explanation-2: -Kinetic energy depends on the velocity of the object squared. This means that when the velocity of an object doubles, its kinetic energy quadruples.
Detailed explanation-3: -To calculate the amount of kinetic energy, k, use the formula k=12mv2 k = 1 2 m v 2 . Because velocity is squared in this formula, it has an exponential rather than linear effect on energy. If velocity is doubled, kinetic energy is quadrupled.
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