Physics
posted by jhockens .
While standing on a bridge 19.1 m above the ground, you drop a stone from rest. When the stone has fallen 3.40 m, you throw a second stone straight down. What minimal initial velocity must you give the second stone if they are both to reach the ground at the same instant? Take the downward direction to be the negative direction.

Physics 
Damon
how long to fall 3.4 m ?
(1/2) (9.81) t^2 = 3.4
t = .833 seconds
how long to fall 19.1 meters ?
(1/2)(9.81) t^2 = 19.1
t = 1.97 seconds
so second rock fall for (1.97.833) = 1.14 seconds
19.1 = Vi t + (1/2)(9.81) t^2
19.1 = Vi (1.14)  (1/2)(9.81)(1.14)^2
1.14 Vi = 19.1 + 6.37
Vi = 11.2 m/s
Respond to this Question
Similar Questions

physics
While standing on a bridge 15.0 m above the ground, you drop a stone from rest. When the stone has fallen 3.10 m, you throw a second stone straight down. What initial velocity must you give the second stone if they are both to reach … 
physics
While standing on a bridge 15.0 m above the ground, you drop a stone from rest. When the stone has fallen 3.10 m, you throw a second stone straight down. What initial velocity must you give the second stone if they are both to reach … 
college physics
While standing on a bridge 15.0 m above the ground, you drop a stone from rest. When the stone has fallen 3.10 m, you throw a second stone straight down. What initial velocity must you give the second stone if they are both to reach … 
physics
While standing on a bridge 15.0 m above the ground, you drop a stone from rest. When the stone has fallen 5.00 m, you throw a second stone straight down. What initial velocity must you give the second stone if they are both to reach … 
physics
While standing on a bridge 18.5 m above the ground, you drop a stone from rest. When the stone has fallen 2.80 m, you throw a second stone straight down. What minimal initial velocity must you give the second stone if they are both … 
physics
While standing on a bridge 45.0 m above ground, you drop a stone from rest. When the stone has fallen 3.80 m, you throw a second stone straight down. What initial velocity must you give the second stone if they are both to reach the … 
Physics
While standing on a bridge 45.0 m above ground, you drop a stone from rest. When the stone has fallen 3.90 m, you throw a second stone straight down. What initial velocity must you give the second stone if they are both to reach the … 
Physics
While standing on a bridge 45.0 m above ground, you drop a stone from rest. When the stone has fallen 3.90 m, you throw a second stone straight down. What initial velocity must you give the second stone if they are both to reach the … 
Physics
While standing on a bridge 18.3 m above the ground, you drop a stone from rest. When the stone has fallen 2.60 m, you throw a second stone straight down. What minimal initial velocity must you give the second stone if they are both … 
physics
While standing on a bridge 30.0 m above the ground, you drop a stone from rest. When the stone has fallen 3.20 m, you throw a second stone straight down. What initial velocity must you give the second stone if they are both to reach …