physics
posted by Elizabeth .
A tennis ball is thrown horizontally at a speed of 10 m/s from the top of a building 78.4 meters high. How long does it take the ball to hit the street?

physics 
drwls
Hint:
The answer has nothing to do withe the 10 m/s horizontal velocity com[ponent.
Just calculate how long it takes for an object to fall 78.4 m
Y = (1/2) g t^2
(ignoring air resistance)
Solve for t. 
physics 
Damon
Exactly as long as it takes to fall 78.4 meters since it had zero initial vertical velocity (only horizontal).
(1/2)(9.8) t^2 = 78.4
Respond to this Question
Similar Questions

Physics
A tennis ball is struck such that it leaves the racket horizontally with a speed of 53 m/s. The ball clears the net and hits the ground a horizontal distance 29 m from where it was hit. How long was the ball in the air and how high … 
Physics
The ball is thrown upward with a speed of 38.0m/s from the top of a building 240 meters tall. How long will it take for this ball to reach the highest point? 
physics, please help me, this question is hard
John Stands at the edge of a flat roof of a three story building and throws a 180g ball straight up into the air that reaches a height of 3.0 meters above the roof. ( building is 14 meters high) A. What is the initial speed of the … 
Physics
Standing on the top ledge of a 55 m high building you throw a ball straight up with an initial speed of 45 m/s. How long to the nearest second, does it take to hit the ground? 
physics
A ball is thrown horizontally from the top of a building 150 meters high. The ball strikes the ground 56 meters horizontally from the point of release. What is the speed of the ball just before it strikes the ground? 
physics
A ball is thrown horizontally from the top of a building 150 meters high. The ball strikes the ground 56 meters horizontally from the point of release. What is the speed of the ball just before it strikes the ground? 
physics
A ball is thrown horizontally from the top of a building 150 meters high. The ball strikes the ground 56 meters horizontally from the point of release. What is the speed of the ball just before it strikes the ground? 
Physics
Ball A is thrown upward from the top of a building and takes 12 s to hit the ground. Ball B is thrown downward with the same speed as Ball A and takes 7 s to hit the ground. How long does it take for ball A to reach it peak? 
ap physics
a ball 1 is thrown horizontally from the top of a building that is 50 meters tall. if another ball 2 is dropped at the same time as the first is released, which ball will hit the ground first? 
College Physics
A ball is thrown horizontally from the top of a building which is 30.6 meters tall. It lands 50.0 meters from the base of the building. What was the launch speed of the ball?