A person with a spring balance with a body hanging from it goes up in an aeroplane, then the reading of the weight of the body as indicated by the spring balance will ___________

Acceleration is the rate at which an object's velocity changes over time. It's a vector quantity, which means it has both magnitude and direction.  Acceleration is represented by the equation a = Δv/Δt, where a is acceleration, Δv is the change in velocity, and Δt is the change in time. This equation allows you to measure how quickly velocity changes in meters per second squared (m/s^2).  Acceleration is one of the components of kinematics, which is the study of motion. Acceleration usually means that the speed is changing, but not always. For example, when an object moves in a circular... Show more

Acceleration is the rate at which an object's velocity changes over time. It's a vector quantity, which means it has both magnitude and direction. 
Acceleration is represented by the equation a = Δv/Δt, where a is acceleration, Δv is the change in velocity, and Δt is the change in time. This equation allows you to measure how quickly velocity changes in meters per second squared (m/s^2). 

Acceleration is one of the components of kinematics, which is the study of motion.
Acceleration usually means that the speed is changing, but not always. For example, when an object moves in a circular path at a constant speed, it is still accelerating because the direction of its velocity is changing. 

Note: In physics, the use of positive and negative always has a physical meaning. As used here to describe the velocity and the acceleration of a moving object, positive and negative describe a direction. 
 

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