CBSE Class 12-science Answered
Vectors:
Asked by | 01 Jun, 2009, 10:35: PM
Expert Answer
Let A be the original position of the girl.
AB=4 (westwards)
Let C be to the north of B So
angle CBA=90 degrees
She travels 30 degrees east of North, so she moves at 30 degrees to BC.
Her position after 3 Km is D say.
angle DBA=60 degrees
Drop perpendicular from D onto AB meeting it at E say.
now,
BE=3cos 60
ED=3sin60
Use AE=AB-EB=4-3cos60
now, use pythagoras' thm for triangle AED, to find AD which is the required distance
Answered by | 09 Jun, 2009, 08:18: PM
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