Physics

Problem

A soccer ball is kicked from level ground and lands on a plateau that is

5.0\,\text{m}

higher than the launch point. The horizontal distance to the landing point is

40\,\text{m}

, and the launch angle is

45^{\circ}

above the horizontal. Neglect air resistance and use

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

. What was the ball’s initial speed? a)

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

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

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

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