How Do You Calculate Cannonball Trajectory from a Cliff?

AI Thread Summary
To calculate the trajectory of a cannonball fired from a 75m cliff at a 30-degree angle with an initial speed of 120m/s, one must consider the forces acting on the cannonball, primarily gravity. Key calculations involve determining the minimum speed, the time until the cannonball hits the ground, and its speed just before impact. The discussion emphasizes the importance of writing down relevant equations and showing work to understand the problem better. Guidance is preferred over direct answers to foster learning. Understanding the physics involved is crucial for solving the trajectory problem effectively.
Timmy96
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Homework Statement


A 2.5kg cannonball is fired from the top of a 75m cliff at an angle of 30 degrees above the horizontal with an initial speed of 120m/s.

Homework Equations


What is the minimum speed of the cannonball?
When does the cannonball hit the ground?
What is it's speed just before it hits the ground?

The Attempt at a Solution


I don't really have an attempt as I am not sure where to start but I would prefer guidance on how to complete the problem instead of just receiving answers.
 
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Timmy96 said:

Homework Statement


A 2.5kg cannonball is fired from the top of a 75m cliff at an angle of 30 degrees above the horizontal with an initial speed of 120m/s.

Homework Equations


What is the minimum speed of the cannonball?
When does the cannonball hit the ground?
What is it's speed just before it hits the ground?

The Attempt at a Solution


I don't really have an attempt as I am not sure where to start but I would prefer guidance on how to complete the problem instead of just receiving answers.

What happens to the cannon ball after it is fired; that is, what forces are acting on the ball itself while it is aloft?
 
just gravity
 
Good. Now write down some relevant equations under 2. And show what you have done under 3.
 

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