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(C) According to the triangle law of vector addition,if three forces are represented by the sides of a triangle taken in the same order,their resultan

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remain constant

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(C) According to the triangle law of vector addition,if three forces are represented by the sides of a triangle taken in the same order,their resultant is zero.In the given triangle $PQR$,the forces are $\overrightarrow{PQ}$,$\overrightarrow{QR}$,and $\overrightarrow{RP}$.Since they are in the same order,the net force $\overrightarrow{F}_{net} = \overrightarrow{PQ} + \overrightarrow{QR} + \overrightarrow{RP} = \overrightarrow{0}$.According to Newton's second law,$\overrightarrow{F}_{net} = m\overrightarrow{a}$.Since $\overrightarrow{F}_{net} = \overrightarrow{0}$,the acceleration $\overrightarrow{a} = \overrightarrow{0}$.Therefore,the velocity $\overrightarrow{V}$ of the particle remains constant.

$A$ particle moving with velocity $\overrightarrow{V}$ is acted upon by three forces represented by the vector triangle $PQR$. The velocity of the particle will

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