The solution 410 is correct. Splendid, bobbym!
411. A 1.5 meter tall boy is standing at some distance from a 30 m tall building. The angle of elevation from his eyes to the top of the building increases from 30 degrees to 60 degrees as he walks towards the building. Find the distance he walked towards the building.
The Answer #6200 is correct. Neat work, bobbym!
#6201. What is a 'Cryostat'?
#6202. Name the science of mechanics that deals with the launching, flight, behavior, and effects of projectiles, especially bullets, gravity bombs, rockets, or the like; the science or art of designing and accelerating projectiles so as to achieve a desired performance.