A walker walks 30 m from the origin toward the EAST to point A. She then walks from point A 20 m more toward the EAST to point B. The walker's total displacement form the origin is
A. 50 m toward the EAST.
B. 30 m toward the WEST.
C. 20 m toward the WEST.
D. 10 m toward the EAST.
E. 10 m toward the WEST.
A. 50 m toward the EAST.
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Fill in the blank(s) with the appropriate word(s).
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a. Line absorption b. Continuous c. Line emission d. Ultraviolet
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