\textbf{183.} A projectile of mass $m$ with initial speed $V_\circ$ is launched at angle $\alpha$ to the horizontal and reaches the ground after $2t$ seconds. What is the magnitude of the change in momentum of the projectile during the first $t$ seconds of motion? (Neglect air resistance.)
$$2mgt \quad (1) \qquad mgt \quad (2) \qquad \dfrac{mv_\circ}{2} \quad (3) \qquad \dfrac{2mv_\circ}{2} \quad (4)$$
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