• Support PF! Buy your school textbooks, materials and every day products Here!

Projectile Motion in 2D

  • Thread starter blue__boy
  • Start date
  • #1
8
0
A cannon ball is fired horizontally at a speed of 1000.0m/s from a height of 200.0m

a.) How long does it take for the ball to land?
6.39s
b.) Where does it land?
6390m
c.) What is its velocity when it lands?



I get the a and b part....but i just don't understand what am i supposed to do with c.)

Thx for helping =]
 

Answers and Replies

  • #2
325
0
You can use constatnt acceleration formulae to calculate the y velocity and the x velocity as it lands seperately.
Because the y and x axes are perpendicular to each other, you are able to use pythagoras' theorem to calculate the total velocity (the hypotenuse in this case).
 
  • #3
8
0
oh....i am having trouble finding the vertical velocity too.....
 
  • #4
325
0
initial vertical velocity = 0ms-1, because it is only fired horizontally (no vertical components).
height = 200m
acceleration = -9.81ms-2

we can use the constant acceleration formulae: vf^2 = vi^2 + 2as --> Where s is displacement.
 

Related Threads on Projectile Motion in 2D

  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
2
Views
1K
  • Last Post
Replies
1
Views
852
  • Last Post
Replies
3
Views
1K
  • Last Post
Replies
3
Views
5K
  • Last Post
Replies
6
Views
1K
  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
3
Views
2K
  • Last Post
Replies
1
Views
822
  • Last Post
Replies
1
Views
4K
Top