Projectile motion of a fired cannon ball

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SUMMARY

The discussion focuses on the projectile motion of a cannonball fired at an angle of 36.9° and its impact time on a building 400 meters away. The correct time for the cannonball fired at this angle is determined to be 5.0 seconds using the equation x = (V0 * Cos 36.9°)t. Additionally, when the cannonball is fired horizontally from a height of 150 meters, the participants discuss the need to calculate the time it will take to hit the building, emphasizing the importance of understanding horizontal velocity components.

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KEVIN Phlem
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1. A cannonball is fired toward a vertical building 400 m away
with an initial velocity of at 36.9° above the horizontal.
The ball will hit the building in
A. 4.0 s. B. 5.0 s.
C. less than 4.0 s. D. more than 5.0 s.

2. If the cannonball in the previous question is fired horizontally
from a 150-m-high cliff, but still 400 m from the building, then
the ball will hit the building in
A. 4.0 s. B. 5.0 s.
C. less than 4.0 s. D. more than 5.0 sI used x =(Vo * Cos 36.9)t and got 5.0 s, which is correct, but i don't know how to solve for #2
 
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KEVIN Phlem said:
1. A cannonball is fired toward a vertical building 400 m away
with an initial velocity of at 36.9° above the horizontal.
The ball will hit the building in
A. 4.0 s. B. 5.0 s.
C. less than 4.0 s. D. more than 5.0 s.

2. If the cannonball in the previous question is fired horizontally
from a 150-m-high cliff, but still 400 m from the building, then
the ball will hit the building in
A. 4.0 s. B. 5.0 s.
C. less than 4.0 s. D. more than 5.0 sI used x =(Vo * Cos 36.9)t and got 5.0 s, which is correct, but i don't know how to solve for #2
What is the horizontal component of velocity in this case?

By the way: What is the value of V0 ?
 
100 m/s, sorry
 
KEVIN Phlem said:
100 m/s, sorry
That answers which question?
 
SammyS said:
That answers which question?
The first one.
 
KEVIN Phlem said:
The first one.
KEVIN Phlem said:
The first one.
In that case it must have answered both.

V0 is the horizontal component if it fired horizontally.
 

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