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BRAINLIEST HELP PLEASE
Given vector u= 20(cos30^degrees, sin30^degrees what are the magnitude and direction of −3u?

−60; −90°
−60; 30°
60; 90°
60; 210°

Respuesta :

sqdancefan

Answer:

  (d)  60; 210°

Step-by-step explanation:

The factor -3 is equivalent to 3∠180°. The given product is then ...

  u = 20∠30°

  -3u = (3∠180°)(20∠30°) = (3·20)∠(180°+30°) = 60∠210°

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