sentence1: If two blocks having mass -LRB- m1 -RRB- and -LRB- m2 -RRB- are pushed with a force F on a frictionless surface and begin moving with a uniform acceleration ` a ' , what would be the force between the two blocks ?
sentence2: Physics : Two masses M and m are connected by a weightless string . They are pulled by a force F on a frictionless horizontal surface . The tension in the string will be ?