A ball of mass 50 grams is moving with a velocity of 15 m/s. What is its kinetic energy?
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A.
5.625 J
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B.
7.500 J
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C.
3.750 J
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D.
1.875 J
Correct Answer:
A. 5.625 J
Explanation:
The kinetic energy of an object is calculated using the formula KE = 1/2mv², where m represents mass and v represents velocity. First, convert the mass from grams to kilograms by dividing 50 g by 1,000, resulting in 0.05 kg. Substituting the values into the equation, KE = 0.5 × 0.05 kg × (15 m/s)², which simplifies to 0.5 × 0.05 × 225, yielding a final value of 5.625 J.
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