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Dynamic - is concerned with the mechanical movement of solid bodies.
               Mechanics - is the science or study of the action of forces on a body.





               5.2  Velocity And Acceleration


               The speed / Velocity- the rate of change of distance with respect to time. A scalar quantity.

                                                           -1
               speed = (distance traveled) / (time taken)   ms : unit



               Average speed - when a body through a distance, s1 meters within the time t1 and s2 meter distance

               in time t2 seconds of a point o, then:


               average speed=  (total distance traveled ) / (total time taken)

                                                     -1
               average speed = (S1 + S2) / (t1 + t2)   ms : unit








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