Physics

Problem

A stone is projected vertically downward with a velocity of

5\,\text{m/s}

from the edge of a cliff. After

4\,\text{s}

its speed becomes

45\,\text{m/s}

. Take the downward direction as positive. a. (i) Calculate the numerical value of the acceleration acting on the stone. b. (ii) Determine the displacement of the stone in the first

4\,\text{s}

of its motion. c. (iii) Find its velocity after

6\,\text{s}

from the instant it was projected.

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