JEE Main 2020PhysicsCenter of Mass Momentum and CollisionEasyNumerical

JEE Main 2020 — Center of Mass Momentum and Collision Question with Solution

JEE Main 2020 (06 Sep Shift 1)

Question

Two bodies of the same mass are moving with the same speed, but in different directions in a plane. They have a completely inelastic collision and move together thereafter with a final speed which is half of their initial velocities of the two bodies (in degree) is -

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Show full solutionCorrect answer: 120
Correct answer
120

Step-by-step explanation

Momentum conservation along x direction

2mvcosθ=(2m)v2

cosθ=12

θ=60°

then angle between their initial velocities

= 120°

 

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About this question

This is a previous-year question from JEE Main 2020, covering the Center of Mass Momentum and Collision chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.