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KCET2025PhysicsLaws of Motion

A block of certain mass is placed on a rough floor. The coefficients of static and kinetic friction between the block and the floor are 0.4 and 0.25 respectively. A constant horizontal force F =20 ~N acts on it so that the velocity of the block varies with time according to the following graph. The mass of the block is nearly (Take g =10 ~ms ⁻² )

Options

  1. A4.4 kg
  2. B1.2 kg
  3. C1.0 kg
  4. D2.2 kg

Correct answer

D. 2.2 kg

Step-by-step solution

Friction must be kinetic aligned & a = v - u t = 20-0 3 = 20 3 ~m / s ^2 & ~F - f _ k = ma aligned aligned & 20-0.25 ~m 10= m 20 3 & ~m =2.2 ~kg aligned

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