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  • Help me please, Two blocks A and B of masses 3m and m respectively are connected by a massless and inextensible string. The whole system is suspended by a massless spring as shown in figure. The magnitudes of acceleration of A and B immediately after

Two blocks A and B of masses 3m and m respectively are connected by a massless and inextensible string. The whole system is suspended by a massless spring as shown in figure. The magnitudes of acceleration of A and B immediately after the string is cut, are respectively:

 

  • Option 1)

     

    \frac{\text{g}} {3}\text{,g}

  • Option 2)

    g, g

  • Option 3)

    \frac{g}{3},\: \frac{g}{3}

  • Option 4)

    g, \frac{g}{3}

 

Answers (1)

best_answer

As we learnt in 

Reaction or Normal Force -

A force which is perpendicular to the surface in contact.

- wherein

                      

 

Before cut Kx = 4mg

After cut T=0

a=\frac{kx-3mg}{3m}

a=\frac{4mg-3mg}{3m}

a=\frac{g}{3}


Option 1)

 

\frac{\text{g}} {3}\text{,g}

Incorrect

Option 2)

g, g

Correct

Option 3)

\frac{g}{3},\: \frac{g}{3}

Incorrect

Option 4)

g, \frac{g}{3}

Incorrect

Posted by

divya.saini

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