TS EAMCET 04 May 2019 Shift 2 Solved Paper

A block of mass 2 kg is connected to an ideal spring and is placed on a smooth horizontal surface. The spring is pulled to move the block and at an instant, the speed of end A of the spring and speed of the block were measured to be 6 m/s and 3 m s respectively. At this moment the potential energy stored hi the spring is increasing at a rate 15 J/s. Find the acceleration of the block at tins instant.