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NEET2013PhysicsLaws of MotionActual

Three blocks with masses m, 2 m 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 ?

Options

  1. AZero
  2. B2 mg
  3. C3 mg
  4. D6 mg

Correct answer

A. Zero

Step-by-step solution

Since all the blocks are moving with constant velocity, then the net force on the all blacks will be zero.

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