Motion in a Straight line · UPSC CDS/OTA · Question 30 of 30

Motion in a Straight line – Question 30

Step-by-step solution. Motion in a Straight line for UPSC CDS/OTA.

Topic
Motion in a Straight line
Subject
General Studies
Difficulty
Medium
Solve Time
45–60 sec

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Q · Motion in a Straight lineMedium · 45s

A stone dropped from a tower takes 4 s to reach the ground. What is the height of the tower? (Take g = 9.8 m/s²)

TopicMotion in a Straight line
Question Typemultiple choice
DifficultyMedium
Marking+1 / −0.33
Test Duration30 min

Step-by-Step Solution

The complete worked solution.

Every step explained — no skipped algebra.

h = (1/2)gt² = 0.5 × 9.8 × 16 = 78.4 m.

Final Answer: Option C — 78.4 m
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Motion in a Straight line Question 30 – UPSC CDS/OTA