physics
posted by Anonymous .
A cannonball is fired horizontally from the top of a cliff. The cannon is at height = 70.0 above ground level, and the ball is fired with initial horizontal speed . Assume acceleration due to gravity to be = 9.80 .

physics 
Damon
Well, you did not say what the question is but you have two problems, a vertical problem and a horizontal problem
The vertical problem is the ball falls 70 meters (I assume) in t seconds
The horizontal problem is he ball proceeds at constant initial speed u for the same t seconds.
Vertical
initial vertical speed = 0
initial height = 70
final height = 0
acceleration = g = 9.8 m^s^2
0 = 70 + 0 t + (1/2)(9.8) t^2
4.9 t^2 = 70
t = 3.78 seconds in the air
Now you did not say what initial speed u was, although I am sure the problem in the book did so and also included the missing units. So
distance = rate * time = u * 3.78 meters 
physics 
Henry
Anonymous, check your 2211,12:26am post.

physics 
Anonymous
I need to know the initial velocity and the units are meters
Respond to this Question
Similar Questions

Physics
a) A cannonball is fired horizontally from the top of a cliff. The cannon is at height H = 100 m above ground level, and the ball is fired with initial horizontal speed v_0. Assume acceleration due to gravity to be g = 9.80 m/s^2. … 
Physics
Someone posted the question below, stating that they knew the answer to part A but needed help with part B. Well even with the answer for A, I can't figure it out! Can you take a step back from the question below to show me the steps … 
physics
10. A cannon elevated at an angle of 35º to the horizontal fires a cannonball, which travels the path shown in the diagram below. [Neglect air resistance and assume the ball lands at the same height above the ground from which it … 
physics
King Arthur's knights fire a cannon from the top of the castle wall. The cannonball is fired at a speed of 54 m/s and at an angle of 34°. A cannonball that was accidentally dropped hits the moat below in 1.1 s.(a) (a)How far from … 
physics
a cannonball is fired horizontally from the top of a cliff. the cannon is at height H=60.0m above ground level , and the ball is fired with initial horizontal speed v_0 .assume acceleration due to gravity to be g=9.80 find d/2 int … 
physics
King Arthur's knights fire a cannon from the top of the castle wall. The cannonball is fired at a speed of 42 m/s and at an angle of 33°. A cannonball that was accidentally dropped hits the moat below in 1.6 s. (a) How far from the … 
physic
A cannon ball is fired at an angle of 30° above horizontal with an initial speed vi = 55 m/s. Assume the cannon ball leaves the cannon at ground level and ignore air resistance. (a) How long is the cannon ball in the air? 
physics
A cannonball is fired with a velocity of 551 m/s. If the cannon is aimed 12° above the ground, how far away does the cannonball land? 
physics
a projectile is fired at an angle of 27 above the horizontal from the top of a cliff 500 ft high. The initial speed of projectile is 1670 ft/s. How far will it move horizontally before hitting the level ground at the base of the cliff? 
physics
A cannon is mounted on a tower above a wide, level field. The barrel of the cannon is 20 m above the ground below. A cannonball is fired horizontally with an initial speed of 900 m/s. Assuming air resistance can be neglected, approximately …