MCQ practice · SSC Physics Board questions · Chapter 2: Motion
Which is the second law of falling bodies?
Think it through first, then pick an option.
- a v ∝ t
- b v ∝ g
- c h ∝ t
- d h ∝ t²
Answer and explanation
Correct answer: a v ∝ t
The second law: the velocity gained in a given time by a body falling freely from rest is proportional to that time, that is v ∝ t.
Why the other options are wrong
- b v ∝ g: It is not v ∝ g: g is a fixed value (9.8 m/s²), not a varying quantity to which the velocity could be proportional.
- c h ∝ t: It is not h ∝ t: the law of distance is h ∝ t², which is the third law.
- d h ∝ t²: h ∝ t² is the third law, not the second.
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