Prove that the speed of a particle increases if

PHYSICS · Subjective · CBSE · Physics · Motion in a Straight Line · Motion in a Straight Line

Problem

Prove that the speed of a particle increases if v⋅a>0\mathbf{v}\cdot\mathbf{a}>0, decreases if v⋅a<0\mathbf{v}\cdot\mathbf{a}<0, and remains constant if v⋅a=0\mathbf{v}\cdot\mathbf{a}=0.

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