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RIch asked the Naked Scientists: 3 objects connected by a string on a frictionless surface. You pull the string with a force of 30 newtons. What is the tension on the other two strings connecting the objects?What do you think?
Wait a minute. How many strings are there?Anyway, assuming the objects are supported on a horizontal frictionless surface, the objects must be continuously accelerating while a force of 30N is acting on the string.
Tommy you are thinking very wrongly here force= mass x acceleration in the absence of friction the presence of a force (for example a rocket motor) creates continuous acceleration. no friction means that even the tiniest force will cause acceleration.