Physics

Problem

A stone is projected vertically upward with an initial speed of

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

. Take the upward direction as positive and

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

downward. (i) Find its velocity after

3.0\,\text{s}

. (ii) Determine its displacement from the point of projection at that instant.