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MHT CET202015 Oct 2020Evening ShiftPhysicsLaws of MotionActual

A block of mass m is moving on a rough horizontal surface. The coefficient of kinetic friction between block and surface is _ k , The net force exerted by the surface on the block is ( g = acceleration due to gravity )

Options

  1. Amg (1+ _ k )^ 1 / 2
  2. B[ mg (1+ _ k ) ]^ 1 / 2
  3. Cmg (1+ _ k ² )
  4. Dmg (1+ _ k ² )^ 1 / 2

Correct answer

D. mg (1+ _ k ² )^ 1 / 2

Step-by-step solution

Given that: If body of mass (m ) moving with rough horizontal surface Kinetic fiction = u ( aligned F_ net &= f₁²+f₃ ² &= (m g² )²+(l m g)² aligned ) (F=m g 1+ ² = ) option (A ) is correct

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