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4-1.Newton's Laws of Motion
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A particle moving with velocity $\overrightarrow{\mathrm{V}}$ is acted by three forces shown by the vector triangle $PQR$. The velocity of the particle will 
Aincrease
Bdecrease
Cremain constant
Dchange according to the smallest force $\overrightarrow {Q R}$
(NEET-2019)
Solution
$\overrightarrow {\mathrm{F}}_{\mathrm{rest}}=\overrightarrow {\mathrm{F}_{1}}+\overrightarrow {\mathrm{F}_{2}}+\overrightarrow {\mathrm{F}_{3}}=\overrightarrow {0}$
$\Rightarrow \overrightarrow {a}=0$
$\overrightarrow v=$ constant
$\Rightarrow \overrightarrow {a}=0$
$\overrightarrow v=$ constant
Standard 11
Physics
