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QJEEM20Phe6ed: JEE Main 2020 Physics - Class 11 JEEM20Phe6ed Solution: Two bodies of the same mass are moving with the same speed, but …

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 speed. The angle between the initial velocities of the two bodies (in degree) is ________.

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JEE Main 2020 (Online) 6th September Morning Slot Physics - Center of Mass and Collision Question 67 English Explanation

Momentum conservation along x,

mv0 × cos θ\theta × 2 = 2m ×\times (v02)\left( {{{{v_0}} \over 2}} \right)

⇒\Rightarrow cos θ\theta = 12{1 \over 2}

⇒\Rightarrow θ\theta = 60o

∴\therefore 2 θ\theta = 120o

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