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MHT CET2012PhysicsCenter of Mass, Momentum and Collision

A ball of mass 0.1 ~kg strikes a wall normally with a speed of 30 ~ms ⁻¹ and rebounds with a speed of 20 ~ms ⁻¹ . The impulse of the force exerted by the wall on the ball is

Options

  1. A1 ~N - s
  2. B5 ~N - s
  3. C2 ~N -s
  4. D3 ~N - s

Correct answer

B. 5 ~N - s

Step-by-step solution

Impulse = Change is momentum p_ i -p_ f direction of p_ f and p_ i apposite to each other. aligned & Impulse =m u-(-m v) &=m u+m v=m(u+v)=0.1(30+20) &=0.1 50=5 ~N - s aligned

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