Question 1: The SI units of momentum are ...
Answer: b, kg * m / s
Question 2: Momentum is a
Answer: b, vector (it has the same direction as its velocity component)
Question 3: If the net external forces on an object are zero, then its momentum must be
Answer: constant. The time derivative of momentum is force: dp ---- = external forces dt So if the external forces are zero, then the CHANGE in momentum with time must be zero; hence, momentum must be a constant
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