# Physics

A projectile is fired straight upward at
143 m/s.
How fast is it moving at the instant it
reaches the top of its trajectory?

How fast is it moving at the instant it reaches
the top of its trajectory if the projectile is
fired upward at 12◦
from the ho

1. 👍
2. 👎
3. 👁
1. It only has vertical speed.
That speed is zero at the top.
=======================
Now the real one
at top vertical velocity is zero
HOWEVER the is NO horizontal force, so horizontal component is constant for the whole trip
u = 143 cos 12 = 140 m/s

1. 👍
2. 👎
👤
Damon

## Similar Questions

1. ### AP Physics - Work and Energy

A projectile is fired at an upward angle of 45 degrees from the top of a 265-m cliff with a speed of 185 m/s. What will be its speed when strikes the ground below? (Use conservation of energy.) I have a diagram of it but I don't

2. ### physics

a projectile with a muzzle velocity of 550 m/s is fired from the a gun on top of a cliff 460 m above the sea level at a certain angle with respect to the horizontal. if the projectile hits the ocean surface. 49.2 seconds after

3. ### math

recall that the acceleartion due to earth's gravity is 32 ft/sec^2. from ground level, a projectile is fired straight upward with velocity 90 feet per second. a. what is its velocity after 3 seconds b. when does it hit the ground

4. ### AP Calculus

A projectile fired upward from ground level is to reach a maximum height of 1,600 feet. What is its initial velocity?

1. ### Physics Help

A projectile is fired at an upward angle of 60 degrees with a speed of 100m/s. It lands on a plateau 150m higher. What is the projectile's speed the moment before it strikes the plateau? I'm thinking to just use the kinematic

2. ### physics

A projectile is fired at an upward angle of 45 degrees from the top of a 265 m cliff with a speed of 350 m/s. What will be it's speed when it strikes the ground below?

3. ### college algebra

The height of a projectile fired upward is given by the formula s = v0t – 16t2, where s is the height, v0 is the initial velocity and t is the time. Find the times at which a projectile with an initial velocity of 128 ft/s will

4. ### Physics

1. Which statement below is true? a. If a car is traveling eastward, its acceleration is eastward. b. If a car's speed is decreasing, its acceleration must be negative. c. If a particle is moving, it must have a non-zero

1. ### Math

A projectile is fired with an initial velocity of 350 feet per second at an angle of 45° with the horizontal. To the nearest foot, find the maximum altitude of the projectile. The parametric equations for the path of the

2. ### pre calculus

A projectile is fired straight upward from ground level with an initial velocity of 320 feet per second. (Assume t = 0 seconds corresponds to the time the object is fired. Use 32 feet/second2 as acceleration due to gravity.) (a)

3. ### Dynamics

Fundamental Problem 15.12 The cannon and support without a projectile have a mass of 250 kg. If a 20 kg projectile is fired from the cannon with a velocity of 400 m/s , measured relative to the cannon, determine the speed of the

4. ### pre-calc

analyzing the motion of a projectile: a projectile is fired from a cliff 200 feet above the water at an inclination of 45 degrees, with a muzzle velocity of 50 feet per second. the height of the projectile above the water is given