1. You let go of a 0.3kg ball from a height of 2m. When the ball bounces off the ground, it loses 15% of its energy as sound.
   1. What is the speed of the ball right before it hits the ground?
   2. What is the speed of the ball right after it hits the ground?
   3. How much energy does the ball loose during the bounce?
   4. How high does the ball bounce back up after hitting the ground?
   5. What initial speed would the ball need to be thrown downward at so that it would bounce back up to a maximum height of 2m?