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The vector −a has the same magnitude as the vector a but has opposite direction. In
the example in Fig. 5.3, b = −a
Just as two vectors can be added to form a combined vector, we can decompose any vector
into two perpendicular vectors which, when added together, form the original vector. In
Fig. 5.6, the length of the vector a (the length of OA) is a. Considering the right-angled
triangle OAB, we can see that OB = a cos(θ) and BA = OC = a sin(θ). So if we know
the direction θ of the vector a, we can resolve it into components a cos(θ) and a sin(θ) in
the x and y directions. Equally, starting from these com
sebab i takut u tak faham..u tak depan i nak bantu u..sory..
boleh bantu u je..dgn nota..sory