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4-1.Newton's Laws of Motion
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For a free body diagram shown in the figure, the four forces are applied in the ' $x$ ' and ' $y$ ' directions. What additional force must be applied and at what angle with positive $x$-axis so that the net acceleration of body is zero?

A
$\sqrt{2} N , 45^{\circ}$
B
$\sqrt{2} N , 135^{\circ}$
C
$\frac{2}{\sqrt{3}} N , 30^{\circ}$
D
$2 N , 45^{\circ}$
(JEE MAIN-2022)
Solution
Let addition force required is $=\overrightarrow{ F }$
$\overrightarrow{ F }+5 \hat{ i }-6 \hat{ i }+7 \hat{ j }-8 \hat{ j }=0$
$\overrightarrow{ F }=\hat{ i }+\hat{ j },|\overrightarrow{ F }|=\sqrt{2}$
Angle with X-axis: $\tan \theta=\frac{ y \text { component }}{ x \text { component }}=\frac{1}{1}$
$\theta=45^{\circ}$
Standard 11
Physics
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