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Saturday, 31 October

JEE Main 2021 · PhysicsNumerical answerNumerical valueEasyCalculation

JEE Main 18 March 2021, Shift 2, Physics Q21

Question 21 of 90 in this shift, Physics question 21 of 30, Section B.

The projectile motion of a particle of mass 5 g is shown in the figure. The initial velocity of the particle is 525\sqrt{2} ms−1^{-1} and the air resistance is assumed to be negligible. The magnitude of the change in momentum between the points A and B is x×10−2x\times10^{-2} kgms−1^{-1}. The value of xx, to the nearest integer, is _________.

The figure, in words

A horizontal line with points A (left) and B (right); a curved arc (with an arrowhead pointing right at the top) goes from A to B; the angle between the line and the path is marked 45° at A and 45° at B; a small arrow at A marks the initial velocity direction.

Official answer

5

NTA final key.

Chapter
Motion in a Plane
Topic
Projectile Motion
Idea tested
Change in Momentum During Flight

Same topic in other shifts

All Projectile Motion questions
  1. 4 Apr 2026, Shift 1 · Q31The two projectiles are projected with the same initial velocities at the 15∘15^\circ and 30∘30^\circ with respect to the horizontal. The…EasySingle correct
  2. 4 Apr 2026, Shift 2 · Q29If xx and yy coordinates of a projectile as a function of time (tt) are given as 24t24t and 43.6t−4.9t243.6t-4.9t^2, respectively, then the angle…EasySingle correct
  3. 4 Apr 2026, Shift 2 · Q47A gun mounted on the ground fires bullets in all directions with same speed. The farthest distance the bullets could reach is 6.4 m. The…EasyNumerical value
  4. 8 Apr 2026, Shift 2 · Q31Two identical bodies, projected with the same speed at two different angles cover the same horizontal range RR. If the time of flight of…MediumSingle correct
  5. 3 Apr 2025, Shift 1 · Q29The angle of projection of a particle is measured from the vertical axis as ϕ\phi and the maximum height reached by the particle is…MediumDiagram basedHas a figure
  6. 3 Apr 2025, Shift 2 · Q27A particle is projected with velocity uu so that its horizontal range is three times the maximum height attained by it. The horizontal…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.