A runner on a straight north–south path slows from to in

PHYSICS · Subjective · AP · Physics 1: Algebra-based · Kinematics · Kinematics

Problem

A runner on a straight north–south path slows from +9.0 m/s+9.0\,\text{m/s} to −3.0 m/s-3.0\,\text{m/s} in 4.0 s4.0\,\text{s}, where north is the positive direction. Calculate the signed change in velocity Δv\Delta v experienced by the runner.

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