what is differences b/w speed and velocety?

Kinematics is the branch of classical mechanics that describes the motion of points, bodies (objects) and systems of bodies (groups of objects) without consideration of the causes of motion.^[1][2][3] The term is the English version of A.M. Ampère''s cinématique,^[4] which he constructed from the Greek κ?νημα, kinema (movement, motion), derived from κινε?ν, kinein (to move).^{[5] [6]}

The study of kinematics is often referred to as the geometry of motion.^[7] (See analytical dynamics for more detail on usage).

To describe motion, kinematics studies the trajectories of points, lines and other geometric objects and their differential properties such as velocity and acceleration. Kinematics is used in astrophysics to describe the motion of celestial bodies and systems, and in mechanical engineering, robotics and biomechanics^[8] to describe the motion of systems composed of joined parts (multi-link systems) such as an engine, a robotic arm or the skeleton of the human body.

The study of kinematics can be abstracted into purely mathematical expressions. For instance, rotation can be represented by elements of the unit circle in the complex plane. Other planar algebras are used to represent the shear mapping of classical motion in absolute time and space and to represent the Lorentz transformations of relativistic space and time. By using time as a parameter in geometry, mathematicians have developed a science of kinematic geometry.

The use of geometric transformations, also called rigid transformations, to describe the movement of components of a mechanical system simplifies the derivation of its equations of motion, and is central to dynamic analysis.

Kinematic analysis is the process of measuring the kinematic quantities used to describe motion. In engineering, for instance, kinematic analysis may be used to find the range of movement for a given mechanism, and, working in reverse, kinematic synthesis designs a mechanism for a desired range of motion.^[9] In addition, kinematics applies algebraic geometry to the study of the mechanical advantage of a mechanical system, or mechanism.

In simple we say speed=total distance travelled/totat time taken and velocity=shortest distance between initial and final position/total time taken to cover this distance

Speed=total distance travelled/totat time taken Velocity is the rate of change in displacement with respective. velocity=shortest distance between initial and final position/total time taken to cover this distance

       
    Speed=distance/time while velocity= displacement/time.
    SI unit of both are m/s
    speed is a scalar quantity while displacement is a vector quantity.
    velocity can be positive , zero, or negative while speed can be positive only.

Speed =distance /time Distance means the actual distance travelled by the body Velocity = displacement/timeDisplacement means the shortest distance travelled the body between initial and final position Speed is a scalar quantity Where as displacement and velocity both are vector So speec can only be positive where as displacement can be positive,zero or negative

Speed=total distance covered/ total time taken..it is scalar quantity (only magnitude) Velocity =distance between initial and final position /time..... It is vector quantity (magnitude and direction)

Speed

Speed is equal to distance divided by time and velocity is displacement divided by time speed scalar quantity and velocity is vector quantity speed has only magnitude but no direction but velocity of both magnitude and direction

Speed=dist./time vel.=disp./time ...................................................... ...................................................... ......................................................

Speed gas no direction associated with it whereas velocity has direction associated with it. Hence we can say that speed is a scalar quantity whereas velocity is a vector quantity.

Speed is scalar while velocity is vector quantity. Velocity has direction speed doesnt have thats the reason for why speed is always positive while velocity is negative also.