In april 1974, john massis of belgium managed to move two passenger railroad cars. he did so by clamping his teeth down on a bit that was attached to the cars with a rope and then leaning backward while pressing his feet against the railway ties. the cars together weighed 700 kn (about 71 tons). assume that he pulled with a constant force that was 2.2 times his body weight, at an upward angle θ of 25˚ from the horizontal. his mass was 82 kg, and he moved the cars by 3 m. neglecting any retarding force from the wheel rotation, find the speed of the cars at the end of the pull.