1. The problem statement, all variables and given/known data A hemispherical dome has a diameter of 100m. A search light was placed at point A as shown at the middle of the dome at B. A balloon was released vertically at a velocity of 4m/s. How fast will the shadow of the balloon move alone the roof if it traveled 25 m vertically. Image link:http://bit.ly/rem8PG [Broken] 2. Relevant equations 3. The attempt at a solution I don't know how to start this. I dont understand the nature of the shadow and why did it bounce off the wall like as shown in the image. What relationship should i use? Please help me to solve this step by step. I'm willing to learn.