The tow truck with attached 1200-kg car accelerates uniformly from 30 km/h to 70 km/h ov...

The tow truck with attached 1200-kg car accelerates uniformly from 30 km/h to 70 km/h over a 15-s interval. The average rolling resistance for the car over this speed interval is 500 N. Assume that the 60 angle shown represents the time average configuration and determine the average tension in the tow cable.