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16 October, 14:13

A runner traveled 15 kilometers north then backtracked 11 kilometers south before stopping. His resultant displacement was

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Answers (2)
  1. 16 October, 14:22
    0
    Resultant displacement is 4 km north.

    Explanation:

    Let east represents positive x - axis and north represent positive y - axis. Horizontal component is i and vertical component is j.

    A runner traveled 15 kilometers north then backtracked 11 kilometers south before stopping,

    So initial displacement, 15 kilometers north = 15 j km

    Second displacement, 11 kilometers south = - 11 j km

    Total displacement = 15 j - 11 j = 4 j km

    Total displacement is 4 km north.
  2. 16 October, 14:43
    0
    displacement is 4 km in north direction.

    Explanation:

    we are given

    A runner traveled 15 kilometers north first

    then backtracked 11 kilometers south

    we have to find displacement=d=?

    assume that east side represents + ve x - axis (horizontal)

    and

    north represent + ve y - axis (vertical)

    we can take x-axis (horizontal) as i

    and y-axis (vertical) as j.

    Displacement = 15 j - 11 j = 4 km north
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