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Saturday, 31 October

JEE Main 2022 · PhysicsMultiple choiceSingle correctMediumCalculation

JEE Main 28 June 2022, Shift 2, Physics Q33

Question 33 of 90 in this shift, Physics question 3 of 30, Section A.

A block of mass 2 kg moving on a horizontal surface with speed of 4 ms−1^{-1} enters a rough surface ranging from xx=0.5 m to xx=1.5 m. The retarding force in this range of rough surface is related to distance by F=−kx=-kx where k=12 Nm−1^{-1}. The speed of the block as it just crosses the rough surface will be :
  1. (1)zero
  2. (2)1.5 ms−1^{-1}
  3. (3)2.0 ms−1^{-1}Official answer
  4. (4)2.5 ms−1^{-1}

Official answer

Option 3

NTA final key.

Chapter
Work, Energy and Power
Topic
Work and Kinetic Energy
Idea tested
Work by Variable Force

Same idea in other shifts

Asked 7× in all
  1. 3 Apr 2025, Shift 2 · Q31A block of mass 1 kg, moving along xx with speed vi=10v_i = 10 m/s enters a rough region ranging from x=0.1x = 0.1 m to x=1.9x = 1.9 m. The…MediumSingle correct
  2. 9 Apr 2024, Shift 2 · Q51A force (3x2+2x−5)(3x^2+2x-5) N displaces a body from x=2x=2 m to x=4x=4 m. Work done by this force is ___________ J.EasyNumerical value
  3. 11 Apr 2023, Shift 1 · Q59A force F⃗=(2+3x)i^\vec{F} = (2 + 3x)\hat{i} acts on a particle in the xx direction where F is in newton and xx is in meter. The work done by…EasyNumerical value
  4. 15 Apr 2023, Shift 1 · Q54A block of mass 10 kg is moving along x-axis under the action of force F=5x NF = 5x\ N. The work done by the force in moving the block from…EasyNumerical value
  5. 25 Jul 2021, Shift 2 · Q21A force of F=(5y+20)j^F=(5y+20)\hat{j} N acts on a particle. The workdone by this force when the particle is moved from yy=0 m to yy=10 m is…EasyNumerical value
  6. 4 Sep 2020, Shift 2 · Q3A person pushes a box on a rough horizontal plateform surface. He applies a force of 200 N over a distance of 15 m. Thereafter, he gets…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. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.