A light spring has a mass of 0.20 kg suspended from its lower end. A second mass of 0.10 kg is suspended from the first by a thread. The arrangement is allowed to come into static equilibrium and then is burned through. At this instant, what is the upward acceleration of the 0.20 kg mass. ( take g= 10 m s^-2) Answer according to the booklet is 5.0 m s^-2 total weight acting on the first spring is 3 N ( i think so..) Then i don't really know how to proceed...help..!!!!!!!