Acceleration || Retardation || Only for Class 9 || काश पहले ये मिलता ||

This video is all about acceleration. Acceleration: Acceleration of a body is defined as the rate of change of velocity of the body with time. • SI unit of acceleration is m/s² or ms¯². • Acceleration is a vector quantity. • Acceleration may be zero, +ve or –ve. • The –ve acceleration is called retardation. • The direction of acceleration is along the direction of velocity. • The –ve acceleration (i.e. retardation) is in a direction opposite to the direction of velocity of the body. #Acceleration #Motion9