Physics

Problem

A ball of mass

0.20\,\text{kg}

is projected vertically upward from the ground with an initial speed of

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

. Ignore air resistance and take

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

. a. (a) Find the speed of the ball when it is

8.0\,\text{m}

above the ground while moving upward. b. (b) Determine its speed at the same height of

8.0\,\text{m}

while descending. c. (c) Calculate the maximum height the ball attains above the ground.