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KVPY2011PhysicsMotion in One Dimension

A girl standing at point P on a beach wishes to reach a point Q in the sea as quickly as possible. She can run at 6 ~km ~h ⁻¹ on the beach and swim at 4 ~km ~h ⁻¹ in the sea. She should take the path

Options

  1. APAQ
  2. BPBQ
  3. CPCQ
  4. DPDQ

Correct answer

C. PCQ

Step-by-step solution

In beach velocity is higher beach is rarer and sea is denser medium So when it go from rarer to denser medium it bend toward normal to reach in minimum time.

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