physics
posted by randy .
In an historical movie, two knights on horseback start from rest 72.6 m apart and ride directly toward each other to do battle. Sir George's acceleration has a magnitude of 0.280 m/s2, while Sir Alfred's has a magnitude of 0.250 m/s2. Relative to Sir George's starting point, where do the knights collide?

physics 
drwls
The space between the knights diminishes at a rate 0.530 m/s^2
Collision occurs when
(1/2)*0.530 t^2 = 72.6 m
t^2 = 274
t = 16.55 s
George will have moved
(1/2)*0.280*t^2 = 38.35 m
from his initial position at that time  a bit more than half the initial separation.
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