Learn

Saturday, 31 October

JEE Main 2021 · PhysicsMultiple choiceSingle correctMediumCalculation

JEE Main 25 July 2021, Shift 2, Physics Q2

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

A balloon was moving upwards with a uniform velocity of 10 m/s. An object of finite mass is dropped from the balloon when it was at a height of 75 m from the ground level. The height of the balloon from the ground when object strikes the ground was around : (takes the value of gg as 10 m/s2^2)
  1. (1)125 mOfficial answer
  2. (2)300 m
  3. (3)200 m
  4. (4)250 m

Official answer

Option 1

NTA final key.

Chapter
Motion in a Straight Line
Topic
Kinematics in 1D
Idea tested
Dropping Objects from Moving Frames

Same idea in other shifts

Asked 3× in all
  1. 8 Apr 2026, Shift 2 · Q29A gas balloon is going up with a constant velocity of 10 m/s. When this balloon reached a height of 75 m, a stone is dropped from it and…EasySingle correct
  2. 5 Sep 2020, Shift 1 · Q3A helicopter rises from rest on the ground vertically upwards with a constant acceleration g. A food packet is dropped from the helicopter…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. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.