Given M1=300g , M2=600gThe System is released from rest. After 2 seconds the larger mass (M2) is stopped. Find the time elapsed before the string is taut again ??

hello Ashray...!

Probably the answer of this question should be 2 seconds...

firstly you have to find the force due to tension of the strings...well, after that u must find out the displacement and acceleration of the string...and then apply the 2nd equation of motion i.e., s=ut+1/2at²...where u=0 and a=3.26(after my calculating)...by this u get the answer which is 2 seconds...!