Physics

Problem

A ball is thrown upwards from the edge of a cliff with velocity

20.0 \text{ m s}^{-1}

. It reaches the bottom of the cliff

6.0 \text{ s}

later. Take

g = 10 \text{ m s}^{-2}

. a. a Determine the height of the cliff. b. b Calculate the speed of the ball as it hits the ground.