JEE Main 2021 · PhysicsNumerical answerNumerical valueEasyCalculation

JEE Main 24 February 2021, Shift 2, Physics Q21

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

Two solids A and B of mass 1 kg and 2 kg respectively are moving with equal linear momentum. The ratio of their kinetic energies

(\mathrm{K.E.})_A : (\mathrm{K.E.})_B

will be

\frac{A}{1}

, so the value of A will be __________.

Official answer

NTA final key.

Chapter: Work, Energy and Power
Topic: Work and Kinetic Energy
Idea tested: Momentum and Kinetic Energy Relation

Same idea in other shifts

Asked 12× in all

6 Apr 2024, Shift 1 · Q31Four particles $A, B, C, D$ of mass $\frac{m}{2}$ , $m$ , $2m$ , $4m$ , have same momentum, respectively. The particle with maximum kinetic…EasySingle correct
6 Apr 2024, Shift 2 · Q36When kinetic energy of a body becomes 36 times of its original value, the percentage increase in the momentum of the body will be :EasySingle correct
8 Apr 2024, Shift 1 · Q35Three bodies A, B and C have equal kinetic energies and their masses are 400 g, 1.2 kg and 1.6 kg respectively. The ratio of their linear…EasySingle correct
27 Jan 2024, Shift 1 · Q35Two bodies of mass 4 g and 25 g are moving with equal kinetic energies. The ratio of magnitude of their linear momentum is :EasySingle correct
8 Apr 2023, Shift 1 · Q54The momentum of a body is increased by $50\%$ . The percentage increase in the kinetic energy of the body is ________ %.EasyNumerical value
8 Apr 2023, Shift 2 · Q54A body of mass 5 kg is moving with a momentum of 10 kg ms $^{-1}$ . Now a force of 2 N acts on the body in the direction of its motion for 5…EasyNumerical value
13 Apr 2023, Shift 1 · Q34Two bodies are having kinetic energies in the ratio 16 : 9. If they have same linear momentum, the ratio of their masses respectively is :EasySingle correct
26 Jul 2022, Shift 2 · Q34A body of mass 8 kg and another of mass 2 kg are moving with equal kinetic energy. The ratio of their respective momenta will be :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. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.