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Question

Forces with magnitudes proportional to AB,BC and 2CA act along the sides of a triangle ABC in order. Their resultant is represented in magnitude and direction by:


A
CA
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B
AC
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C
BC
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D
CB
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Solution

The correct option is A CA
AB+BC+CA=0 since AB+BC=AC and CA=AC
AB+BC+2CA=(AB+BC+CA)+CA=0+CA=CA

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