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KVPY2020PhysicsMotion in One Dimension

A mouse jumps off from the 15 th floor of high-rise building and lands 12   m from the building. Assume that each floor is of 3   m height. The horizontal speed with which the mouse jumps is closest to :

Options

  1. A0
  2. B5   kmph
  3. C10   kmph
  4. D15   kmph

Correct answer

D. 15   kmph

Step-by-step solution

Time of fall = 2 h g = 2 × 45 10 t = 3   sec horizontal distance = horizontal velocity × time 12 = v × 3 3 = 4 × 18 5   km   hr - 1 v = 14 . 4   km   hr - 1 v ≈ 15   km   hr - 1

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