Physics

Problem

A stone is projected vertically upward with speed

25\,\text{m/s}

. It passes a point

A

that is

20\,\text{m}

above the point of projection twice—once while going up and once while coming down. What is its speed at point

A

? (Take

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

.) a)

19.8\,\text{m/s}

15.3\,\text{m/s}

20.7\,\text{m/s}

12.5\,\text{m/s}