An elevator starts from rest with a constant upward acceleration. It moves 0.78 m in the first 0.69 s of its acceleration. A passenger in the elevator is holding a 1.8 kg box by a vertical string. What is the tension in the string while the elevator is accelerating?

Which statement is the best definition of an atom? a) anything that has mass and occupies space. b) the smallest particle that has the properties of an element. c) a substance that cannot be broken down chemically into simpler substances. eliminate d) the smallest unit of a substance that exhibits all of the properties characteristic of that substance.