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KVPY2017PhysicsMotion in One Dimension

A person goes from point P to point Q covergin 1 / 3 of the distance with speed 10 ~km / hr , the next 1 / 3 of the distance at 20 ~km / hr and the last 1 / 3 of the distance at 60 ~km / hr . The average speed of the person is

Options

  1. A30 ~km / hr
  2. B24 ~km / hr
  3. C18 ~km / hr
  4. D12 ~km / hr

Correct answer

C. 18 ~km / hr

Step-by-step solution

V_ avg = Total Distance total time = S S / 3 10 + S / 3 20 + S / 3 60 ~V _ avg =18 ~km / hr

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