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Saturday, 31 October

JEE Main 2022 · PhysicsMultiple choiceSingle correctMediumMulti-step

JEE Main 28 July 2022, Shift 2, Physics Q5

Question 5 of 90 in this shift, Physics question 5 of 30, Section A.

A bullet of mass 200 g having initial kinetic energy 90 J is shot inside a long swimming pool as shown in the figure. If it's kinetic energy reduces to 40 J within 1 s, the minimum length of the pool, the bullet has to travel so that it completely comes to rest is

The figure, in words

Bullet entering a long swimming pool of water horizontally (arrow shows direction of motion), labelled 'Water' and 'Pool'.
  1. (1)45 mOfficial answer
  2. (2)90 m
  3. (3)125 m
  4. (4)25 m

Official answer

Option 1

NTA final key.

Chapter
Work, Energy and Power
Topic
Work and Kinetic Energy
Idea tested
Kinetic Energy Calculation

Same idea in other shifts

Asked 4× in all
  1. 6 Apr 2024, Shift 1 · Q50A bullet of mass 50gg is fired with a speed 100 m/s on a plywood and emerges with 40 m/s. The percentage loss of kinetic energy is :EasySingle correct
  2. 13 Apr 2023, Shift 2 · Q51A car accelerates from rest to u m/s. The energy spent in this process is E J. The energy required to accelerate the car from u m/s to 2u…EasyNumerical value
  3. 17 Mar 2021, Shift 1 · Q12A boy is rolling a 0.5 kg ball on the frictionless floor with the speed of 20 ms−1^{-1}. The ball gets deflected by an obstacle on the…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. 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.