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Friday, 9 October

JEE Main 2025 · PhysicsNumerical answerNumerical valueHardMulti-step

JEE Main 3 April 2025, Shift 1, Physics Q46

Question 46 of 75 in this shift, Physics question 21 of 25, Section B.

Three identical spheres of mass m, are placed at the vertices of an equilateral triangle of length aa. When released, they interact only through gravitational force and collide after a time T=4\mathrm{T} = 4 seconds. If the sides of the triangle are increased to length 2a2a and also the masses of the spheres are made 2m2m, then they will collide after ______ seconds.

Official answer

8

NTA final key.

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Idea tested
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Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.