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JEE Main201910 Apr 2019Evening ShiftPhysicsMotion in One DimensionActual

A bullet of mass 20 g has an initial speed of 1 m s - 1 , just before it starts penetrating a mud wall of thickness 20 c m . If the wall offers a mean resistance of 2.5 × 10 - 2 N , the speed of the bullet after emerging from the other side of the wall is close to:

Options

  1. A0.7 m s - 1
  2. B0.3 m s - 1
  3. C0.1 m s - 1
  4. D0.4 m s - 1

Correct answer

A. 0.7 m s - 1

Step-by-step solution

a = - 2.5 × 10 - 2 20 × 10 - 3 = - 5 4   m   s - 2 From v 2 - u 2 = 2 a s v 2 = u 2 + 2 a s v = 1 2 - 2 × 5 4 × 20 × 10 - 2 = 0.5 = 0.7   m   s - 1

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