# physics

posted by .

a projectile is thrown with the speed of 25 meter per seconds in a direction 30° above the horizontal.
-how high does it go.
-how long does it take to reach the maximum height.
-how long does it reach the Projectile along in the air.
-how far does it go.

• physics -

a. Vo = 25 m/s @ 30 Deg.
Xo = 25*cos30 = 21.7 m/s.
Yo = 25*sin30 = 12.5 m/s.

h = (Y^2-Yo^2)/2g.
h = (0-(12.5)^2) / -19.6=7.97 m.=max ht.

b. Tr = (Y-Yo)/g.
Tr = (0-12.5) / -9.8 = 1.28 s. =Rise time or time to reach max. ht.

c. Tf = Tr = 1.28 s. = Fall time.
Tr+Tf = 1.28 + 1.28 = 2.56 s. = Time in
air.

d. R = Xo*(Tr+Tf).
R = 21.7 * 2.56 = 55.6 m.

## Similar Questions

1. ### math

A projectile is fired directly upward with a muzzle velocity of 860 feet per second from a height of 7 feet above the ground. a. Determine a function for the height of the projectile t seconds after it’s released. b. How long does …
2. ### phy

A blue ball is thrown upward with an initial speed of 20.6 m/s, from a height of 0.8 meters above the ground. 2.5 seconds after the blue ball is thrown, a red ball is thrown down with an initial speed of 8.2 m/s from a height of 23.7 …
3. ### College Algebra

A projectile is thrown upward with an initial velocity of 272 feet per second. After t seconds, its height h(t)above the ground is given by the function : h(t)=-16t^2+272t. a. Determine the projectile's maximum height. b. Determine …
4. ### physics

a projectile is thrown with the speed of 25 meter per seconds in a direction 30° above the horizontal. -how high does it go. -how long does it take to reach the maximum height. -how long does it reach the Projectile along in the air. …
5. ### physics

A red ball is thrown down with an initial speed of 1.2 m/s from a height of 25.0 meters above the ground. Then, 0.6 seconds after the red ball is thrown, a blue ball is thrown upward with an initial speed of 22.9 m/s, from a height …
6. ### Physics

A red ball is thrown down with an initial speed of 1.3 m/s from a height of 28.0 meters above the ground. Then, 0.6 seconds after the red ball is thrown, a blue ball is thrown upward with an initial speed of 24.7 m/s, from a height …
7. ### Algebra 1

a ball is thrown into the air with an upward velocity of 32 ft per second. Its height h in feet after t seconds is given by the function h(t)=-16t^2 +32t+6. How long does it take the ball to reach its maximum height?
8. ### physics

A stone is thrown horizontally outward from the top of a bridge, the stone is released 19.6meter above the street below.the initial velocity of the stone is 5.0m/s.determine the (a)total time that the stone is in the air (b)magnitude …
9. ### Math

Please help ! 1.)a catapult launches a boulder with an upward velocity of 122 feet per second. the height of the boulder, h, in feet after t seconds is givin by the function h(t)=-16t^2+122t+10. what is the boulders maximum height …
10. ### algebra 2

So the dead line for my class is coming up. And I really need help for these questions! 2. Elaine shoots an arrow upward at a speed of 32 feet per second from a bridge that is 28 feet high. The height of the arrow is given by the function …

More Similar Questions