Physics

Problem

From the roof of a

20\,\text{m}

high building, a ball is thrown vertically upward with a speed of

10\,\text{m/s}

. How long will it take to reach the ground level? (Take

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

downward.) a)

1.3\,\text{s}

4.1\,\text{s}

3.3\,\text{s}

2.0\,\text{s}