Two vectors have magnitudes 6 units and 8 units, respectively. Find magnitude of resultant of two vectors if angle between two vectors is 180°.
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a
14 units
b
10 units
c
237 units
d
2 units
answer is D.
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Detailed Solution
Let P and Q be two vectors with magnitude 6 and 8 respectively.Then resultant R,R=P2+Q2+2PQcosθR=62+82+2×6×8×cos180°R=4R=2Magnitude of resultant of two vectors is 2units.