Log1989 problem 2.28

Through a weightless block, a light non-stretchable thread is thrown, to one end of which a weight of 0.5 kg is suspended. At the other end, the threads act with a constant force F = 7.5 N. Disregarding the friction in the block axis, find out how the acceleration of the load 1 will change if the load 2 to the other end of the thread is suspended, whose gravity is 7.5 N. There is no friction in the block .