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HCS (Haryana)Prelims2023General Studies
Question
Which of the following statement(s) about the freely falling objects is/are FALSE? 1. Freely falling objects are the objects falling from a height towards the earth under gravitational force of the earth. 2. The acceleration of a body falling freely towards the earth depends on the mass of the body. 3. If an object is dropped freely-from a height, its initial velocity “u” is zero and if an object is thrown vertically upwards its final velocity ‘v’ becomes zero. Choose the correct answer from the Options given below:
Options
- A 1 and 3 only
- B 2 only
- C 3 only
- D 2 and 3 only
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Correct Answer
B 2 only
Model Answer
- Freely falling objects are indeed those falling under the sole influence of Earth's gravity. Hence, Statement 1 is correct.
- The second statement contradicts a fundamental principle of gravity discovered by Galileo Galilei. All objects in a vacuum, regardless of their mass, experience the same acceleration due to gravity. This means a feather and a bowling ball dropped from the same height will hit the ground at the same time in a vacuum, assuming no air resistance. Hence, Statement 2 is not correct.
- An object dropped freely starts with zero initial velocity (u = 0), and an object thrown upwards eventually reaches a point where its velocity becomes zero at the peak of its trajectory. Hence, Statement 3 is correct.