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Saturday, 31 October

JEE Main 2020 · PhysicsMultiple choiceSingle correctEasyCalculation

JEE Main 4 September 2020, Shift 2, Physics Q3

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

A 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 progressively tired and his applied force reduces linearly with distance to 100 N. The total distance through which the box has been moved is 30 m. What is the work done by the person during the total movement of the box ?
  1. (1)3280 J
  2. (2)5690 J
  3. (3)2780 J
  4. (4)5250 JOfficial answer

Official answer

Option 4

NTA final key (Sep 2020).

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. 28 Jun 2022, Shift 2 · Q33A 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.…MediumSingle correct
  6. 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

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.