Alan starts from his home and walks 1.3 km east to the library. He walks an additional 0.68 km east to a music store. From there, he walks 1

Alan starts from his home and walks 1.3 km east to the library. He walks an additional 0.68 km east to a music store. From there, he walks 1.1 km north to a friend’s house and an additional 0.42 km north to a grocery store before he finally returns home along the same path. What is his final displacement and total distance traveled?

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  1. Answer: final Displacement = 0 km, total distance covered =7 km

    Explanation:

    Given the following :

    From home to library = 1.3 km East

    Library to music store = 0.68km East

    Music store to friend’s house = 1.1km North

    Friend’s house to grocery store = 0.42 km North

    Displacement is the net change in distance traveled.

    Eastward distance :

    To = (1.3 + 0.68)km = 1.98km East

    Fro = (0.68 + 1.3)km = 1.98 km East

    Δ distance = (1.98 – 1.98) = 0

    Northward direction:

    To = (1.1 + 0.42)km = 1.52km north

    Fro = (0.42 + 1.1)km = 1.52km North

    Δ distance = (1.98 – 1.98) = 0

    Hence final Displacement = 0

    Total distance covered = 2 × (1.3 + 0.68 + 1.1 + 0.42) = 2 × 3.5

    = 7km

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