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Paper 2 · Kinematics and Dynamics

State the SI unit of linear momentum.

Model answer

kg m/s

Also accepted: kg m s^-1, N s

Explanation: From p=mvp = mv, momentum has units of mass (kg) times velocity (m/s), giving kg m s^-1; this is equivalent to N s since a newton is a kg m s^-2.

Derived from ZIMSEC Physics Paper 2, November 2004, Q1

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