Physics
posted by Anonymous .
A rock is thrown horizontally from a bridge hits the water below 30 meter away in the horizontal direction. If the rock was in the air 2seconds, how tall is the bridge?

h = 0.5g*t^2 = 4.9*2^2 = 19.6 m.
Respond to this Question
Similar Questions

Calculus
A rock is thrown upward off a bridge. In 2sec. the rock passes you on the way down. In 3 more sec. it hits the water. How high is the bridge above the water and how high did the rock go above the bridge? 
Physics
A rock is dropped of the side of a bridge and hits the water below 4s later. a. What was the rock’s velocity when it hit the water? 
Physics
A rock thrown from a bridge hits the water below at a horizontal distance x directly below the throwing point. The rock travels a smooth parabolic path in time t. a. Show that the virtical distance of the bridge above water is 1/2gt^2. … 
physics
You're on a magic bridge floating 25 meters above a lake. You through a rock at an angle of sixty degrees. It takes 5.8 seconds for the rock to reach it's highest point. (a) With what speed did you throw the rock? 
physics
A rock thrown horizontally from a bridge hits the water below at a horizontal distance x directly below the throwing point. The rock travels a smooth parabolic path in time t. A.) Show that Therapy vertical distance of the bridge above … 
Physics 2701 Applied
A rock is thrown down with an initial speed of 30.0ft/s from a bridge to the water below. It takes 3.50s for the rock to hit the water. (a) Find the speed (in ft. /s) of the rock as it hits the water. (b) How high is the bridge above … 
Physics
A rock is dropped from a bridge to the water below. It takes 2.40 s for the rock to hit the water. Find the speed (in m/s) of the rock as it hits the water. How high (in metres) is the bridge above the water? 
physics
A rock thrown horizontally from a bridge hits the water below 30 meters away in the horizontal direction. If the rock was in the air for 2 seconds, how tall is the bridge? 
Physics
A rock is thrown horizontally from a bridge with a velocity of 13.0 m/s. It takes the rock 3.5 s to strike the water below. What is the magnitude of the velocity of the rock just before it hits the water? 
Physics
Using energy considerations and assuming negligible air resistance, find the speed of a rock just before it hits the water if it is thrown from a bridge 20.2 m above water with an initial speed of 13.4 m/s?