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

Rajasthan BoardEnglish MediumSTD 11 SciencePhysics4.1 , newtons laws of motion1 Mark
MCQ
Three blocks with masses $m, 2m $ and $3 m$ are connected by strings, as shown in the figure. After an upward force $F$ is applied on block $m,$ the masses move upward at constant speed $v.$ What is the net force on the block of mass $2\ m\ ?\, (g$ is the acceleration due to gravity$)$
  • ✓
    $0$
  • B
    $2\  mg$
  • C
    $3\  mg$
  • D
    $6\  mg$
✓

Answer

Correct option: A.
$0$
a
As all blocks are moving with constant speed, therefore, acceleration is zero. So net force on each block is zero

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