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4.1 , newtons laws of motion — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics4.1 , newtons laws of motion1 Mark
MCQ
A block of mass $M$ is pulled along a horizontal frictionless surface by a rope of mass $M / 2$. If a force $2 Mg$ is applied at one end of the rope, the force which the rope exerts on the block is -
  • A
    $\frac{2 Mg}{3}$
  • B
    $2 Mg$
  • ✓
    $\frac{4 Mg}{3}$
  • D
    $0$
✓

Answer

Correct option: C.
$\frac{4 Mg}{3}$
c
(c)

Acceleration of the system $=\frac{P}{m+M}$

The force exerted by rope on the mass $=\frac{M P}{m+M}$

$=\frac{(M)(2Mg)}{(M/2)+M}=\frac{4 Mg}{3}$

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