speed in a particular direction

(a)  

the moment when two objects hit each other

(a)  

how fast an object is moving

(a)  

a result or change that happens because of an event or process

(a)  

a self-contained unit on an aircraft, spacecraft, vehicle, or vessel that can be detached for a particular function

(a)  

the same in quantity, size, degree, or value

(a)  

acting or going in the reverse direction

(a)  

to apply a force

(a)  

anything that has mass and takes up space

(a)  

a push or a pull that can change the motion of an object

(a)  

the energy an object has because it is moving

(a)  

a force between an object and the surface it is moving over

(a)  

to reach a conclusion using evidence and reasoning

(a)