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Saturday, 31 October

JEE Main 2021 · PhysicsNumerical answerNumerical valueEasyApplication

JEE Main 4 August 2021, Shift 1, Physics Q22

Question 22 of 90 in this shift, Physics question 22 of 30, Section B.

A system shown in the figure is in equilibrium and at rest. The spring and string are massless. When the string is cut, the acceleration of mass ‘2m’ will be ________ m/s2^2. (given g = 10 m/s2^2)

The figure, in words

A spring hangs from a hatched ceiling; a block labelled 2m is attached to the spring's lower end; a string joins the bottom of block 2m to a second block below it labelled m.

Official answer

5

NTA final key.

Chapter
Laws of Motion
Topic
Newton's Laws of Motion
Idea tested
Instantaneous Acceleration: Cutting Springs

Same topic in other shifts

All Newton's Laws of Motion questions
  1. 4 Apr 2026, Shift 2 · Q28At t=0t=0, a body of mass 100 g starts moving under the influence of a force (5i^+10j^)\left(5\hat i+10\hat j\right) N. After 2 s its position is…EasySingle correct
  2. 5 Apr 2026, Shift 1 · Q29Three masses m1=4m_1 = 4 kg, m2=4m_2 = 4 kg and m3=6m_3 = 6 kg are suspended from a fixed smooth frictionless pulley as shown in the figure…MediumSingle correctHas a figure
  3. 5 Apr 2026, Shift 1 · Q30A wedge YY with mass of 10 kg and all frictionless surfaces and the inclined surface making 37∘37^\circ with horizontal. A block XX with…HardSingle correctHas a figure
  4. 6 Apr 2026, Shift 1 · Q29Two blocks (PP and QQ) with respectively masses 2 kg and 1.5 kg are joined by a massless thread. These blocks are mounted on a…HardSingle correctHas a figure
  5. 2 Apr 2025, Shift 2 · Q29A body of mass 1 kg is suspended with the help of two strings making angles as shown in figure. Magnitudes of tensions T1T_1 and T2T_2,…EasySingle correctHas a figure
  6. 7 Apr 2025, Shift 2 · Q28An object with mass 500 g moves along xx-axis with speed v=4xv=4\sqrt{x} m/s. The force acting on the object is :MediumSingle 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.