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18. If two numerically equal forces P and P actingat a point produce a resultant force ofmagnitude P itself, then the angle between thetwo original forces is:(1) 0° (2) 60e (3) 90% (4) 1200

Answer»

P=√P^2+P^2+2P^2 cosxP^2=2P^2+2P^2cosxcosx=-1/2x=120



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