At t = 0, an elevator departs from the ground with uniform speed. At time [itex]T_1[/itex] a child drops a marble through the floor. The marble falls with uniform acceleration g = 9.8 m/s2, and hits the ground [itex]T_2[/itex] seconds later. Find the height of the elevator at time [itex]T_1[/itex]
2. Relevant equations
3. The attempt at a solution
I was sure of the fact that if I set the 3rd equation above to equal zero, I could solve for the initial height; the problem seemed confusing at first but is actually quite trivial. I turned to the back of the book to look for the answer (and I was sure that I was correct), but I got a hint; if [itex]T_1=T_2=4 s[/itex] then [itex]h=39.2 m[/itex]
The 3rd equation gave me zero, and the fourth one gave me 79.4 m or [itex]2h[/itex]. I was able to use this to solve for the velocity of the elevator, but that doesn’t seem to help much. I’m not sure what I’m doing wrong; the height at [itex]T_1[/itex] is [itex]y_0[/itex]. Can someone help me out? This should have been so much easier. I’ve got to be making some mistake in the calculus.