In Bosnia, the ultimate test of a young man\'s courage used to be tojump off a 4
ID: 1680390 • Letter: I
Question
In Bosnia, the ultimate test of a young man's courage used to be tojump off a 400 year old bridge (now destroyed) into the RiverNeretva, 23 m below the bridge. (a) How long did the jump last?1 s
(b) How fast was the jumper traveling upon impact with theriver?
2 m/s
(c) If the speed of sound in air is 342 m/s, how long after the jumper took off did aspectator on the bridge hear the splash?
3 s (a) How long did the jump last?
1 s
(b) How fast was the jumper traveling upon impact with theriver?
2 m/s
(c) If the speed of sound in air is 342 m/s, how long after the jumper took off did aspectator on the bridge hear the splash?
3 s
Explanation / Answer
Assuming no initial velocity; d = 1/2at^2 t = sqrt(2d/a) = sqrt(2d/g) = 2.17 seconds if you take down aspositive vf = vi + at vf = (9.81*2.17) = 21.29 m/s We've already gone 2.17 seconds, and we hit the water. sound experiences no acceleration h = vi*t t = h/vi = 23/342 = 0.0673 seconds 2.17 + 0.0673 = 2.2373 round off as needed