Physics

Problem

A ball is thrown vertically upward from the edge of a balcony

20\,\text{m}

above the ground with a speed of

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

. It rises, returns past the balcony and strikes the ground below. Neglect air resistance and take

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

downward. The speed with which it hits the ground is closest to a)

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

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

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

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