KinematicsEasy
Question
Person A observes B moving in east direction with speed 10 m/s, B observes C moving in south direction with speed 20 m/s, C observes D moving in west direction with speed 30 m/ s & D observes a tree moving with speed 40 m/s in north direction.Then the actual direction of motion of person ′A′ will be :-
Options
A.North - West
B.North - East
C.South - East
D.None of these
Solution
= -10î - (-20ĵ) - (-30î) - 40ĵ
= 20î - 20ĵ
Direction = S - 45o - E
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