First slide
Earth's Magnetism
Question

Two blocks A and B of masses 3 m 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

 

 

Moderate
Solution

 Before the string is cut 

kx=T+3 mg             . . . (i) T=mg                      . . . . (ii)  From eqns. (i) and (ii)  k x=4 m gg,g3

 

 

 

 

Just after the string is cut

aA=kx-3mg3m aA=4mg-3mg3m

=mg3m=g3

 and also aB=g

 

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