Physics

Problem

A stone is thrown with speed

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

at an angle of

45^{\circ}

above the horizontal. Neglecting air resistance and taking

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

, find the height (to the nearest tenth of a metre) when its horizontal displacement is

20\,\text{m}

. a)

20.0\,\text{m}

15.0\,\text{m}

10.2\,\text{m}

9.8\,\text{m}