Alternating Current Wave Particle Duality Models of the Atom 0. Two objects side by side must have the same speed. Acceleration and velocity are always in the same direction. Velocity is a force. If velocity is zero, then acceleration must be zero too.
Acceleration is the same as velocity.
The acceleration of a falling object depends upon its mass. Freely falling bodies can only move downward. There is no gravity in a vacuum. Gravity only acts on things when they are falling. All objects can be moved with equal ease in the absence of gravity.