Physics

Problem

A ball is launched straight upward with an initial speed of

20\,\text{m/s}

. Taking the downward direction to be negative and

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

, how much time elapses before the ball reaches its highest point? a)

4.0\,\text{s}

1.0\,\text{s}

2.0\,\text{s}

2.5\,\text{s}