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Saturday, 31 October

JEE Main 2026 · PhysicsMultiple choiceSingle correctEasyCalculation

JEE Main 6 April 2026, Shift 1, Physics Q33

Question 33 of 75 in this shift, Physics question 8 of 25, Section A.

The position of center of mass of three masses 2 kg, 3 kg and 15 kg placed with respect to mid point (pp) of normal bisector, as shown in the figure is ________.

The figure, in words

Isosceles triangle: 2 kg mass at left base vertex, 3 kg at right base vertex, 15 kg at the apex; equal sides 10 m each, apex angle 120 degrees; P is the midpoint of the base (foot of the normal bisector from the apex).
  1. (1)(34,1.25)\left(\frac{\sqrt{3}}{4},1.25\right)Official answer
  2. (2)(34,1.0)\left(\frac{\sqrt{3}}{4},1.0\right)
  3. (3)(0,0)(0,0)
  4. (4)(1.25,0)(1.25,0)

Official answer

Option 1

NTA final key.

Chapter
System of Particles and Rotational Motion
Topic
Center of Mass
Idea tested
Discrete System COM

Same idea in other shifts

Asked 5× in all
  1. 1 Feb 2024, Shift 1 · Q52The identical spheres each of mass 2M are placed at the corners of a right angled triangle with mutually perpendicular sides equal to 4 m…EasyNumerical value
  2. 25 Jul 2022, Shift 2 · Q52Three identical spheres each of mass M are placed at the corners of a right angled triangle with mutually perpendicular sides equal to 3 m…EasyNumerical value
  3. 29 Jul 2022, Shift 1 · Q36Two bodies of mass 1 kg and 3 kg have position vectors i^+2j^+k^\hat{i} + 2\hat{j} + \hat{k} and −3i^−2j^+k^-3\hat{i} - 2\hat{j} + \hat{k} respectively.…EasySingle correct
  4. 27 Jun 2022, Shift 1 · Q35Two blocks of masses 10 kg and 30 kg are placed on the same straight line with coordinates (0,0)(0, 0) cm and (x,0)(x, 0) cm respectively. The…EasySingle correct

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. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.