posted by Anonymous .
You are conducting an experiment inside a train car that may move horizontally along 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?
1The train is an inertial frame of reference.
2The train is not an inertial frame of reference.
3The train may be at rest.
4The train may be moving at a constant speed in a straight line.
5The train may be moving at a constant speed in a circle.
6The train must be speeding up.
7The train must be slowing down.
8The train must be accelerating.