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08.07.2019 •
Physics
Arunner traveled 15 kilometers north then backtracked 11 kilometers south before stopping. his resultant displacement was
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Ответ:
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.
Ответ:
the answer is b, a protostar reaches a temperature high enough for nuclear fusion to begin.
Explanation:
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