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MHT CET202019 Oct 2020Evening ShiftPhysicsCenter of Mass, Momentum and CollisionActual

'N' number of balls of mass ' m ^ kg moving along positive direction of x - axis, strike a wall per second and return elastically. The velocity of each ball is 'u' m / s . The force exerted on the wall by the balls in newton, is

Options

  1. Am Nu
  2. B0
  3. C2 mNu
  4. DmNu 2

Correct answer

C. 2 mNu

Step-by-step solution

force exerted on the = change in momentom Time wall Now, Initial momentum =N mu i Final momentum =-N m v i Net change =2 Nmu aligned Force &= momentum change 1 qec &= 2 Nm Coption 3 iscorrecto . aligned

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