Posted by brandon on Thursday, June 10, 2010 at 9:49pm.
Superguy is flying at treetop level near Paris when he sees the Eiffel Tower elevator start to fall (the cable snapped). His xray vision tells him Lois LaTour is inside. If Superguy is 1.00 km away from the tower, and the elevator falls from a height of 122.5 m, how long does Superguy have to save Lois, and what must be his average speed?
A) 3.00 s, 333 m/s
B) 5.00 s, 200 m/s
C) 7.00 s, 143 m/s
D) 9.00 s, 111 m/s
E) 10.0 s, 96.0 m/s

physics  drwls, Thursday, June 10, 2010 at 10:05pm
Have you calculated how long it takes the elevator to free fall 122.5 m? That would be a good way to start.
Once you have calculated that time T, the speed required is easy: 1000m/T
One of the choices fits perfectly

physics  brandon, Thursday, June 10, 2010 at 10:50pm
I am really not good at physics. How would I go about finding how long it takes the elevator to fall?
Is it going to have something to do with 9.8m/s?

physics  drwls, Friday, June 11, 2010 at 12:06am
H = (1/2)g T^2, so
T = sqrt(2H/g) is the time to fall
yes, it has something to do with g.
People aren't "good at physics" until they try solving the problems.

physics  A, Sunday, January 27, 2013 at 8:27am
H=1/2gt^2
t=sqrt(2h/g)
=sqrt(2*240/9.8)
=6.99sec
speed=d/t
=1000/7
=142.8m/s
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