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Saturday, 31 October

JEE Main 2020 · PhysicsMultiple choiceSingle correctHardMulti-step

JEE Main 9 January 2020, Shift 1, Physics Q5

Question 5 of 75 in this shift, Physics question 5 of 25, Section A.

A body A of mass m is moving in a circular orbit of radius R about a planet. Another body B of mass m2\frac{m}{2} collides with A with a velocity which is half (v⃗2)\left(\frac{\vec{v}}{2}\right) the instantaneous velocity v⃗\vec{v} of A. The collision is completely inelastic. Then, the combined body :
  1. (1)Escapes from the Planet's Gravitational field
  2. (2)Falls vertically downwards towards the planet
  3. (3)continues to move in a circular orbit
  4. (4)starts moving in an elliptical orbit around the planetOfficial answer

Official answer

Option 4

NTA final key (Jan 2020).

Chapter
Gravitation
Topic
Orbital Mechanics
Idea tested
Horizontal Projection Velocity Regimes

Same topic in other shifts

All Orbital Mechanics questions
  1. 2 Apr 2026, Shift 1 · Q30A planet (P1P_1) is moving around the star of mass 2M2M in the orbit of radius RR. Another planet (P2P_2) is moving around another star…EasySingle correct
  2. 2 Apr 2025, Shift 2 · Q47A satellite of mass 1000 kg is launched to revolve around the earth in an orbit at a height of 270 km from the earth's surface. Kinetic…MediumNumerical value
  3. 7 Apr 2025, Shift 2 · Q31Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : The radius…EasyAssertion–reason
  4. 4 Apr 2024, Shift 2 · Q37Correct formula for height of a satellite from earths surface is:MediumSingle correct
  5. 5 Apr 2024, Shift 1 · Q36Match List I with List II : List I List II (A) Kinetic energy of planet | (I) −GMma-\frac{GMm}{a} (B) Gravitation Potential energy of…MediumMatch the list
  6. 5 Apr 2024, Shift 2 · Q37A satellite revolving around a planet in stationary orbit has time period 6 hours. The mass of planet is one-fourth the mass of earth. The…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.