Answer :
the velocity of the second ball u = 2v
m(v) - m(2v) = m(-v) + m(u)
m(v) + m(v) = m(u)
u = 2v (to left)
A moving object's velocity is defined as its directional speed as an indication of how quickly its position is changing as seen from a certain point of view and as measured by a specific unit of time, such as 60 km/h in a northerly direction. Kinematics, the area of classical mechanics that studies how bodies move, uses the concept of velocity as a fundamental building block.
It takes both magnitude and direction to define velocity, a physical vector quantity. Speed is a coherent derived unit that expresses the scalar absolute value (magnitude) of velocity. Its quantity is expressed in SI (metric system) units of metres per second (m/s or ms1). The terms "5 metres per second" and "5 metres per second east," for instance, denote scalar and vector, respectively.
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