Question map
Not attempted Correct Incorrect ★ Bookmarked
Loading…
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
How others answered
Each bar shows the % of students who chose that option. Green bar = correct answer, blue outline = your choice.
Community Performance
Out of everyone who attempted this question.
57%
got it right
✓ Thank you! We'll review this.

SIMILAR QUESTIONS

CDS-I · 2015 · Q35 Relevance score: 1.34

An object is raised to a height of 3 m from the ground. It is then allowed to fall on to a table 1 m high from ground level. In this context, which one among the following statements is correct ?

NDA-I · 2013 · Q45 Relevance score: 0.25

If an object undergoes a uniform circular motion, then its

CDS-II · 2011 · Q97 Relevance score: -0.95

When a ball drops onto the floor it bounces. Why does it bounce ?

IAS · 1998 · Q114 Relevance score: -0.98

A ball is dropped from the top of a high building with a constant acceleration of 9.8 m/s2. What will be its velocity after 3 seconds ?

NDA-I · 2008 · Q8 Relevance score: -1.02

A rubber ball dropped from 24 m height loses its kinetic energy by 25%. What is the height to which it rebounds?