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NTA Abhyas JEE Main2020PhysicsCenter of Mass, Momentum and CollisionPractice

A particle of mass m moving with a speed u strikes a smooth horizontal surface at an angle 45 ° . The particle rebounds at an angle ϕ with speed v , if coefficient of restitution is 1 3 , then the angle ϕ is

Options

  1. A30 o
  2. B45 o
  3. C60 o
  4. D37 o

Correct answer

A. 30 o

Step-by-step solution

In y direction v sin ⁡ ϕ = e u sin ⁡ 45 o         … . i In x direction v cos ⁡ ϕ = u cos ⁡ 45 o         … . i i Equation i ÷ i i tan ⁡ ϕ = 1 3 ;   ϕ = 30 o

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