The positive x-direction is defined to the right

PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

The positive x-direction is defined to the right. Arrow A is 4 cm long pointing to the right, and arrow B is 2 cm long pointing to the left. Using the scale 1 cm → 1 m, which pair of algebraic expressions best represents the two displacement vectors? (a) A: +4 mB:+2 m+4\,\text{m}\quad B: +2\,\text{m} (b) A: +4 mB:−4 m+4\,\text{m}\quad B: -4\,\text{m} (c) A: +4 mB:−2 m+4\,\text{m}\quad B: -2\,\text{m} (d) A: +0.04 mB:−0.02 m+0.04\,\text{m}\quad B: -0.02\,\text{m}

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