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 \nu. What is the net force on the block of mass 2m?

(g is the acceleration due to gravity)

 

  • Option 1)

    6 mg

  • Option 2)

    zero

  • Option 3)

    2 mg

  • Option 4)

    3 mg

 

Answers (1)

As we learnt in

Lift is moving down with a = g -

a=g

mg-R=mg

R=0

- wherein

Apparent weight = 0 (weightlessness)

 

 

 

\because     All the blocks are moving with constant velocity. so Fnet = 0.

Correct option is 2.


Option 1)

6 mg

Incorrect

Option 2)

zero

Correct

Option 3)

2 mg

Incorrect

Option 4)

3 mg

Incorrect

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