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Q3 (CDS-II/2022) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Basic mechanics concepts Answer Verified

An object is dropped from a height onto the floor. Which one of the following remains uniform as it falls?

Result
Your answer: —  Â·  Correct: A
Explanation

When an object is dropped from a height, it enters a state of free fall under the sole influence of gravity. In a uniform gravitational field near Earth's surface, the acceleration due to gravity (g) remains constant at approximately 9.8 m/s" [2]. This means the object's acceleration is uniform throughout its descent. In contrast, other parameters change: velocity increases linearly with time, which causes momentum (p = mv) and kinetic energy (KE = 1/2 mv") to increase continuously. Simultaneously, the potential energy (PE = mgh) decreases as the height of the object decreases. According to the principle of conservation of energy, potential energy is transformed into kinetic energy during the fall. Therefore, only the acceleration remains uniform, assuming air resistance is negligible.

Sources

  1. [2] https://www.khanacademy.org/science/5th-grade-science-matatag/xddeaf2509ddf685f:3rd-quarter/xddeaf2509ddf685f:gravity/a/freefall-ap1
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