a 107-kg box on the right and a 43-kg box on the left are tied together by a horizontal cable. the 107-kg box is acted upon by an external force of 598 n to the right. the frictional force exerted by the floor on the 107-kg box is 30 n and the frictional force exerted by the floor on the 43-kg box is 16 n. what is the magnitude of the tension in the connecting cable?