Question

give fast answer friends​

Answer 1

thank you ❤️❤️

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Answer 2

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°