Final answer:
Linear momentum is the product of a system's mass multiplied by its velocity. It is represented by the equation p = mv. The SI unit for momentum is kg.m/s.
Step-by-step explanation:
Linear momentum (momentum for brevity) is defined as the product of a system's mass multiplied by its velocity. In symbols, linear momentum p is defined to be p = mv, where m is the mass of the system and v is its velocity. The SI unit for momentum is kg. m/s.
Newton's second law of motion in terms of momentum states that the net external force equals the change in momentum of a system divided by the time over which it changes. In symbols, Newton's second law of motion is defined to be Fnet = Ap / At, where Ap is the change in momentum, and At is the change time.