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KVPY2012PhysicsMotion in Two Dimensions

A ball falls vertically downward and bounces off a horizontal floor. The speed of the ball just before reaching the floor ( u ₁ ) is equal to the speed just after having contact with the floor ( u ₂ ) ; u ₁= u ₂ . The corresponding magnitudes of accelerations are denoted respectively by a₁ and a₂ . The air resistance during motion is proportional to speed and is not negligible. If g is acceleration due to gravity, th

Options

  1. Aa₁ < a₂
  2. Ba₁>a₂
  3. Ca ₁= a ₂ g
  4. Da ₁= a ₂= g

Correct answer

A. a₁ < a₂

Step-by-step solution

Downward- a₁=g- F_ R m Upward:- a₂=g+ F_ R m a ₂ < a ₁

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