Physics

Problem

A ball is thrown vertically upward with an initial speed of

20\,\text{m/s}

. Taking upward as positive, find the displacement of the ball from the point of projection at the instant its velocity becomes

-10\,\text{m/s}

. a)

+20.4\,\text{m}

+15.3\,\text{m}

-15.3\,\text{m}

+30.6\,\text{m}