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A particle moving with velocity \(V\) is acted upon by three forces shown by the vector triangle PQR. The velocity of the particle will:

1. Increase
2. Decrease
3. Remain constant
4. Change according to the smallest force QR

Correct answer: Remain constant

Solution

A closed vector triangle means the resultant of the three forces is zero. With zero net force, acceleration is zero, so the particle's velocity remains constant.

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