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Saturday, 31 October

JEE Main 2022 · PhysicsMultiple choiceDiagram basedMediumData or graph

JEE Main 27 July 2022, Shift 1, Physics Q32

Question 32 of 90 in this shift, Physics question 2 of 30, Section A.

A bullet is shot vertically downwards with an initial velocity of 100 m/s from a certain height. Within 10s, the bullet reaches the ground and instantaneously comes to rest due to the perfectly inelastic collision. The velocity-time curve for total time t = 20s will be: (Take g = 10m/s2^2).

The figure, in words

Options A-D are v-t graphs (see option texts).
  1. (1)[figure: v-t graph; a straight line sloping downward from the origin to about the -200 m/s level at t = 10 s, then a vertical segment up to the t axis at 10 s, then a horizontal segment along the t axis from 10 s to 20 s; v axis marked -100 m/s and -200 m/s, t axis marked 10 s and 20 s]Official answer
  2. (2)[figure: v-t graph; a straight line sloping downward from +100 m/s at t = 0 to zero at t = 10 s, then a horizontal segment along the t axis from 10 s to 20 s; v axis marked +100 m/s, -100 m/s and -200 m/s, t axis marked 10 s and 20 s]
  3. (3)[figure: v-t graph; a straight line sloping downward from the origin to the -100 m/s level at t = 10 s, then a vertical segment up to the t axis at 10 s, then a horizontal segment along the t axis from 10 s to 20 s; v axis marked -100 m/s, t axis marked 10 s and 20 s]
  4. (4)[figure: v-t graph; a straight line sloping upward from -100 m/s at t = 0 to zero at t = 10 s, then a horizontal segment along the t axis from 10 s to 20 s; v axis marked +100 m/s and -100 m/s, t axis marked 10 s and 20 s]

Official answer

Option 1

NTA final key.

Chapter
Motion in a Straight Line
Topic
Kinematics in 1D
Idea tested
Kinematic Graph Conversion

Same idea in other shifts

Asked 2× in all
  1. 24 Feb 2021, Shift 1 · Q8If the velocity-time graph has the shape AMB, what would be the shape of the corresponding acceleration-time graph ?EasyDiagram basedHas a figure

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.