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Most Important Selected Qs for JEE AdvancedPhysicsLaws of Motion

Paragraph: A block of mass 10 kg is put gently on a belt-conveyor system of infinite length at t =0 sec , which is moving with constant speed 20 m / sec rightward at all time, irrespectively of any situation by means of a motor-system as shown in the figure. Constant force of magnitude 15 N is applied on the block continuously during its motion. Question: The magnitude of acceleration of the block of mass 10 kg at t

Options

  1. A4 ~m / s ^2
  2. B3 ~m / s ^2
  3. C2 ~m / s ^2
  4. Dnone

Correct answer

D. none

Step-by-step solution

In the time interval t=0 sec to t=t₀ sec , till the time. The relative velocity is not zero the nature of friction will be kinetic. aligned & u _ A B =0 i -(20 i )=20 ~m / sec ( i ) & N =100 ~N F _ k =0.25 100=25 ~N aligned aligned & a _A=4 ~m / ^2( i ), a _ B =0 ~m / ^2( i ) & a _ AB = a _ A - a _ B =4 ~m / ^2( i ) & V _ AB = u _ AB + a _ AB t = 0 & t =5 sec aligned When the relative motion between block A and belt conveyor will be zero, the nature of friction will be static and its magnitude will equal to magnitu

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