Learn

Friday, 9 October

JEE Main 2026 · PhysicsMultiple choiceSingle correctMediumMulti-step

JEE Main 2 April 2026, Shift 2, Physics Q28

Question 28 of 75 in this shift, Physics question 3 of 25, Section A.

Two blocks of masses 2 kg and 1 kg respectively, are tied to the ends of a string which passes over a light frictionless pulley as shown in the figure below. The masses are held at rest at the same horizontal level and then released. The distance traversed by the centre of mass in 2 s is (Take g=10g = 10 m/s2^2)

The figure, in words

[figure: pulley system with 2 kg and 1 kg masses connected by string, hatched support at top]
  1. (1)3.333.33 m
  2. (2)5.125.12 m
  3. (3)2.222.22 mOfficial answer
  4. (4)1.421.42 m

Official answer

Option 3

NTA final key.

Chapter
Laws of Motion
Topic
Center of Mass
Idea tested
COM Acceleration in Atwood Machine

Same topic in other shifts

All Center of Mass questions
  1. 6 Apr 2026, Shift 1 · Q33The 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…EasySingle correctHas a figure
  2. 6 Apr 2026, Shift 2 · Q32Two identical bodies A and B of equal masses have initial velocities v⃗1=4i^\vec{v}_1=4\hat{i} m/s and v⃗2=4j^\vec{v}_2=4\hat{j} m/s respectively.…MediumSingle correct
  3. 7 Apr 2025, Shift 1 · Q29A rod of length 5 L is bent right angle keeping one side length as 2 L. The position of the centre of mass of the system: (Consider L = 10…EasySingle correctHas a figure
  4. 8 Apr 2024, Shift 1 · Q52A uniform thin metal plate of mass 10 kg with dimensions is shown. The ratio of xx and yy coordinates of center of mass of plate in…MediumNumerical valueHas a figure
  5. 25 Jul 2021, Shift 1 · Q21A body of mass 2 kg moving with a speed of 4 m/s. makes an elastic collision with another body at rest and continues to move in the…MediumNumerical value
  6. 8 Jan 2020, Shift 1 · Q3The coordinates of centre of mass of a uniform flag shaped lamina (thin flat plate) of mass 4 kg. (The coordinates of the same are shown…EasySingle correctHas a figure

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 42 of the 174 JEE Main shifts held from 2017 to 2026.