A vector →A when added to the vector →B=3^i+4^j yields a resultant vector that is an in the position y -direction and has magnitude equal that of →B find the magnitude →A
A
√10
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B
10
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C
5
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D
√15
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Solution
The correct option is A√10 →A+(3ˆi+4ˆj)=5ˆj→A=−3ˆi+ˆj∣∣∣→A∣∣∣=√10∴optionAiscorrect.