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NTA Abhyas JEE Main2020PhysicsMotion in Two DimensionsPractice

A particle is projected at an angle of 60 ° to the horizontal with a speed of 10 m s - 1 . After some time the direction of its velocity makes an angle of 30 ° to the horizontal. The speed of the particle at this instant is

Options

  1. A5 3   m   s - 1
  2. B5 3   m   s - 1
  3. C5   m   s - 1
  4. D10 3 m s - 1

Correct answer

D. 10 3 m s - 1

Step-by-step solution

Let v be the velocity of the projectile at this instant. The horizontal component of velocity remains unchanged. Therefore, v cos 30 ° = 10 cos 60 ° v 3 2 = 10 2 ∴   v = 10 3   m   s - 1

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