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AP EAMCET202023 Sep 2020Morning ShiftPhysicsMotion in One DimensionActual

When will a body of mass 20 kg moving at 15 m s - 1 , subjected to a retarding force of 100 N , come to rest?

Options

  1. A3   s
  2. B6   s
  3. C1 . 5   s
  4. D9   s

Correct answer

A. 3   s

Step-by-step solution

Given that Retarding force F = 100   N Initial velocity u = 15   m   s - 1 Mass m = 20   kg From newton's second law F = m a ⇒ a = F m = 100 20 = 5   m   s - 2 From equation of motion v = u + a t ⇒ 0 = 15 - 5 t ⇒ t = 3   s

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