Physics

Problem

A projectile is launched from level ground, stays in the air for

6\,\text{s}

, and lands

80\,\text{m}

away. Take

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

. The magnitude of its initial velocity is closest to a)

40.0\,\text{m\,s}^{-1}

28.0\,\text{m\,s}^{-1}

32.3\,\text{m\,s}^{-1}

42.7\,\text{m\,s}^{-1}