You are conducting an experiment inside a train car that may move along level rail tracks. A load is hung from the ceiling on a string. The load is not swinging, and the string is observed to make a constant angle of with the horizontal. No other forces are acting on the load. Which of the following statements are correct? 1./train is an inertial reference frame 2./train is not an inertial reference frame 3./train may be instantaneously at rest 4./The train may be moving at a constant speed in a straight line. 5./ The train may be moving at a constant speed in a circle. 6./The train must be speeding up. 7./The train must be slowing down. 8./The train must be accelerating I'm thinking 2./ and 8./ as the angle of 45 degrees indicates a force acting on the load, thus meaning that the train is not an inertial reference frame, but I'm not totally shore if I am on the right track??