# Physics urgent pls!

posted by .

A ball is tossed from an upper-storey window of a building.The ball is given an initial velocity of 8 m/s at an angle of 20 degrees below the horizontal.it strikes the ground 3s later .(a) How far horizontally from the base of the building does the ball strike the ground? (b)Find the height from which the ball was thrown. (c) How long does it take the ball to reach a point 10.0m below the level of launching?

• Physics urgent pls! -

Vo = 8 m/s. @ 20o = Initial velocity.
Xo = 8*cos20 = 7.52 m/s = Hor. comp.
Yo = 8*sin20 = 2.74 m/s = Ver. comp.

a. d = Xo * Tf = 7.52m/s * 3s.=22.56 m.

b. h = Yo*Tf + 0.5g*Tf^2.
h = 2.74*3 + 4.9*3^2 = 52.32 m.

c. h = Yo*t + 0.5g*t^2 = 10 m.
2.74t + 4.9t^2 = 10
4.9t^2 + 2.74t - 10 = 0
t = 1.18 s.

• Physics urgent pls! -

how did you get that 0.5g??

• Physics urgent pls! -

in reply to "how did you get that 0.5g??":
0.5g= (1/2)(g)=(1/2)(9.8)

## Similar Questions

1. ### Physics

From the window of a building, a ball is tossed from a height y0 above the ground with an initial velocity of 8.00 m/s and angle of 20.0 degrees below the horizontal. It strikes the ground 3.00 s later. (a) If the base of the building …
2. ### physic

Hi! Question:A ball is tossed from an upper-story window of a building.The ball is given an initial velocity of 7.80m/s at an angle of 21.0 degrees below the horizontal.It strikes the ground 3.00s later. A.How far horizontally from …
3. ### Physics

A ball is tossed from an upper-story window of a building. The ball is given an initial velocity of 7.70 m/s at an angle of 23.0° below the horizontal. It strikes the ground 6.00 s later. (Ignore air resistance.) (a) How far horizontally …
4. ### Physics

A ball is tossed from an upper-story window of a building. The ball is given an initial velocity of 8.15 m/s at an angle of 18.5o below the horizontal. It strikes the ground 3.30 s later. How far horizontally from the base of the building …
5. ### Physics

A ball is tossed from an upper-story window of a building. The ball is given an initial velocity of 8.15 m/s at an angle of 18.5o below the horizontal. It strikes the ground 3.30 s later. How far horizontally from the base of the building …
6. ### physics

A)A ball is tossed from an upper-story window of a building. The ball is given an initial velocity of 8.15 m/s at an angle of 19.0o below the horizontal. It strikes the ground 2.50 s later. How far horizontally from the base of the …
7. ### Physics

a ball is tossed from an upper story window of a building given an initial velocity of 8m/s at an angle of 20 below the horizontal.it strikes the ground 2seconds later. how far horizontaly from the base of the building does it strike …
8. ### physic

A ball is tossed from an upper-story window of a building. The ball is given an initial velocity of 8.50 m/s at an angle of 15.0° below the horizontal. It strikes the ground 3.00 s later. (a) How far horizontally from the base of …
9. ### physics

A ball is tossed from an upper-story window of a building. The ball is given an initial velocity of 7.50 m/s at an angle of 18.0° below the horizontal. It strikes the ground 5.00 s later. (a) How far horizontally from the base of …
10. ### Physics

A ball is tossed from an upper-story window of a building. The ball is given an initial velocity of 9.40 m/s at an angle of 21.0Â° below the horizontal. It strikes the ground 6.00 s later. (a) How far horizontally from the base of …

More Similar Questions