Answers

2014-12-31T23:27:53+05:30

This Is a Certified Answer

×
Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Initially the spring extends in length, then its restoration force on either end will be same and equal to  - k x, where k = force constant of the spring and x is the extension of the spring.  Hence block A is pulled towards right with the same spring force.

Equations of dynamics of the blocks are 
 
      F1 - k x  =  M_B * a_B
      k x - F2  =  M_A * a_A

    F1 - F2 = M_B * a_B + M_A * a_A 
     100 - 70  = 5 * 4 + 2 * a_A
    
          a_A = 5 m/sec²


1 5 1
please click on thank you link and select best answer
sir can you please explain where did the first equation come from?