Physics

Problem

A ball is thrown downward with an initial speed of

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

from a high balcony. Take upward as the positive direction and

g=10\,\text{m}\,\text{s}^{-2}

. What is the ball’s velocity after

2\,\text{s}

? a)

+16\,\text{m}\,\text{s}^{-1}

-24\,\text{m}\,\text{s}^{-1}

+24\,\text{m}\,\text{s}^{-1}

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