Two vectors of magnitudes 5 units and 4 units are inclined at 60°. What is their scalar product?
Correct answer D. 10 units²
Explanation
A·B = AB cos θ = 5 × 4 × cos 60° = 20 × 0.5 = 10 units². Using sin 60° would give the cross product magnitude of 17.3 units².
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