Question

Two forces of magnitude 7 N and 5 N on
particle alan angle to each other have
value. The minimum magnitude of the resultaat
force is​

Answer 1

Explanation:

R = (√A^2 +B^2 + 2AB cos theta)

R = √ 49 + 25 +70 cos theta

We want minimum value

$- 1 \leqslant \cos(x) \leqslant \: 1$

Putting cos x = -1

we're putting min value so that

it becomes -ve and we'll get minimum value

R = √49 +25 -70

R = √ 4

R = 2