Projectile Motion cannonball

  • #1
Timmy96
2
0

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.
 

Answers and Replies

  • #2
SteamKing
Staff Emeritus
Science Advisor
Homework Helper
12,809
1,670

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?
 
  • #3
Timmy96
2
0
just gravity
 
  • #4
BvU
Science Advisor
Homework Helper
15,094
4,144
Good. Now write down some relevant equations under 2. And show what you have done under 3.
 

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