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Saturday, 31 October

JEE Main 2021 · PhysicsNumerical answerNumerical valueEasyCalculation

JEE Main 18 March 2021, Shift 1, Physics Q24

Question 24 of 90 in this shift, Physics question 24 of 30, Section B.

As shown in the figure, a particle of mass 10 kg is placed at a point A. When the particle is slightly displaced to its right, it starts moving and reaches the point B. The speed of the particle at B is xx m/s. (Take g=10g = 10 m/s2^2) The value of 'x' to the nearest integer is __________.

The figure, in words

Smooth curved track from A (height 10 m above the horizontal surface) down to B (lowest point, height 5 m above the horizontal surface), rising to C on the right.

Official answer

10

NTA final key.

Chapter
Work, Energy and Power
Topic
Work and Kinetic Energy
Idea tested
Conservation of Mechanical Energy

Same idea in other shifts

Asked 7× in all
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  3. 27 Jun 2022, Shift 2 · Q52A rolling wheel of 12 kg is on an inclined plane at position P and connected to a mass of 3 kg through a string of fixed length and pulley…HardNumerical valueHas a figure
  4. 28 Jun 2022, Shift 1 · Q51A pendulum is suspended by a string of length 250 cm. The mass of the bob of the pendulum is 200 g. The bob is pulled aside until the…EasyNumerical valueHas a figure
  5. 26 Aug 2021, Shift 1 · Q21A uniform chain of length 3 meter and mass 3 kg overhangs a smooth table with 2 meter laying on the table. If k is the kinetic energy of…MediumNumerical value
  6. 26 Feb 2021, Shift 2 · Q8A cord is wound round the circumference of wheel of radius r. The axis of the wheel is horizontal and the moment of inertia about it is I.…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.