You are conducting an experiment inside an elevator that can move in a vertical shaft. A load is hung vertically from the ceiling on a string, and is stationary with respect to you. The tension in the string is measured to be 10% less than the force due to gravity on the load. No other forces are acting on the load. Which of the following statements about the elevator are correct?Which of the following statements are trueThe elevator is an inertial frame of reference.The elevator is not an inertial frame of reference.The elevator may be at rest for the duration of the entire experiment.The elevator may be moving at a constant velocity upward.The elevator may be moving at a constant velocity downward.The elevator must be accelerating.

An inertial frame of reference is that frame where the object stays at rest or at constant velocity unless acted by external forces.This means the law of inertia remains true, and force will be the product of mass of the object and its acceleration.

If the load is stationary to the observer and the tension is 10% less then the elevator should be moving in a constant velocity downwards that is why the tension is a bit less than force due to gravity.