Question

Two forces 5 N and 20N are acting at an angle of 120°. Find the magnitude of their resultant.​

Answer 1

Answer:

resultant = whole root a² + b² +2ab cos theta

resultant = √(25+400+200cos 120)

resultant = √(425 + 200(-0.5))

resultant = √(325)N

Answer 2

Answer:

$\sqrt{ {5}^{2} { + 20}^{2} } + 2 0 \times 5 \times 2 + \cos(120)$