# Physics

A ball thrown horizontally at 21m/s from the roof of a building lands 24m from the base of the building. Now high is the building?

1. 👍 0
2. 👎 0
3. 👁 791
1. Refer to these equations.

Vx (Horizontal velocity) (21m/s here)
Vx = dx/t
Dx (Horizontal distance) (24m here)
Dx = vx(t)
Dy (Vertical distance) (missing here)
dy=(1/2)(g)t^2

t is just time.
you can use first or second equation to find time. either one works.
21m/s = 24m / t
t = 24/21 = 1.14 seconds

Now put time value to last equation
dy = (1/2)(9.8)1.14^2

dy = 6.36804 or 6.37m

1. 👍 1
2. 👎 0

## Similar Questions

1. ### Physics

A ball is thrown horizontally at 12.2 m/s from the roof of a building and lands 21.0 m from the base of the building. How high is the building?

2. ### Science

A ball is thrown horizontally from the roof of building 50.m tall and lands 45m from the base. What was the balls initial speed

3. ### Physics

A ball is thrown horizontally from the roof of a building 45cm tall and lands 24.0m from the base. What was the ball's initial velocity?

4. ### physics

A ball thrown horizontally at 13.0m/s from the roof of a building lands 21.4m from the base of the building. How tall is the building?

1. ### Physics

A ball is thrown horizontally from the top of a building. The ball is thrown with a horizontal speed of 8.2 ms^-1. The side of the building is vertical. At point P on the path of the ball, the ball is distance x from the building

2. ### Physics

You are walking around your neighborhood and you see a child on top of a roof of a building kick a soccer ball. The soccer ball is kicked at 41° from the edge of the building with an initial velocity of 21 m/s and lands 59 meters

3. ### physics

A stuntman plans to run across a roof top and then horizontally off it to a land on the roof of the next building . The roof of the next building is 4.8 m below the first one and 6.2 m away from it . Can he make the jump if his

4. ### Physics

A ball is thrown horizontally at 18m/s from the roof of a building lands 28metre from the base of the building. Calculate the height of the building.

1. ### Physics

A ball is dropped from a roof of a building and strikes the ground in 3 seconds. If a second ball is thrown horizontally from the roof, it will hit the ground in:

2. ### Science physics

A boy stands on the roof of a 50m tall building and thrown a ball horizontslly at 20m/s away from the building. How far away from the foot of the building will the ball land?

3. ### Physics

A ball is thrown horizontally from the roof of a building 9.0 m tall and lands 8.5 m from the base. What was the ball's intial speed? I have no idea how to do this problemm or what formulas to use because of the fact that I do not

4. ### physical

baseball is hit with a speed of 30.0 m/s at an angle of 50 It lands on the flat roof of a 10m tall nearby building, If the ball was hit when it was 1.5 m above the ground, what horizontal distance does it travel before it lands on