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The momentum of a moving particle is vectorially given as $\overrightarrow{p}=p_0(\cos t \hat {i}+\sin t \hat {j}).$ Where t stands for time.

Choose the correct option: $\begin{array}{1 1} \text{(a) The applied force is constant.} \\ \text{(b) The momentum is constant.} \\ \text{(c) The applied force always remains perpendicular to momentum.} \\ \text{(d) The applied force is always parallel to the momentum.} \end{array}$

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