The S.I unit of momentum is:
\(\text{Kg-m/s}\)
Linear momentum is defined as the product of an object’s mass and its velocity: \(p = m v\). Its SI unit is therefore the product of the SI unit of mass with the SI unit of velocity.
Step 1 — SI unit of mass is kilogram (kg); SI unit of velocity is metre per second (m/s).
Step 2 — SI unit of momentum \(= \mathrm{kg} \times \mathrm{m/s} = \mathrm{kg\,m/s}\). In dimensional form: \([p] = [MLT^{-1}]\).
The option g-m/s uses the CGS mass unit, kg-cm/s uses CGS length, and kg-m/s2 is actually the SI unit of force (newton). None of these is the SI unit of momentum.
Hence, Kg-m/s.
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