Physics

Problem

A ball is kicked from level ground with an initial speed of

30\,\text{m}\!\cdot\!\text{s}^{-1}

. Neglecting air resistance and taking

g=9.8\,\text{m}\!\cdot\!\text{s}^{-2}

, what is the smaller of the two possible launch angles that will allow the ball to land

50\,\text{m}

away on the same horizontal level? a)

45^{\circ}

33^{\circ}

17^{\circ}

30^{\circ}