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Answer:
→ choose answer (a) 0° , 180° , 90°
Explanation:
for resultant , R² = 12² + 5²+ 2x12x5 cos∝ = 169 + 120 cos∝
cos∝ = (R² - 169)/120
first case , R² = 17²
cos∝ = (17² - 169)/120 = 1 , ∝ = 0°
second case , R² = 7²
cos∝ = (7² - 169)/120 = -1 , ∝ = 180°
third case , R² = 13²
cos∝ = (13² - 169)/120 = 0 , ∝ = 90°
→ choose answer (a) 0° , 180° , 90°
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