Grade 11 Physics: Projectile Motion Calculations

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SUMMARY

The discussion focuses on solving a Grade 11 Physics problem involving projectile motion, specifically calculating the time a bullet is in the air after being shot horizontally from a height of 2.0 meters with a muzzle speed of 325 m/s. The key takeaway is that the time of flight is determined solely by the vertical motion, which is a free fall problem, independent of the horizontal velocity. The relevant formula for calculating the time of free fall is derived from the equation of motion under gravity.

PREREQUISITES
  • Understanding of basic physics concepts, particularly projectile motion
  • Familiarity with the equations of motion under gravity
  • Knowledge of horizontal and vertical motion independence
  • Ability to perform basic algebraic calculations
NEXT STEPS
  • Study the equations of motion for free fall, specifically the formula \( t = \sqrt{\frac{2h}{g}} \)
  • Learn about the independence of horizontal and vertical motions in projectile motion
  • Explore examples of projectile motion problems involving different angles and initial velocities
  • Review the concept of gravitational acceleration and its impact on falling objects
USEFUL FOR

Students studying physics, particularly those in Grade 11, educators teaching projectile motion concepts, and anyone looking to strengthen their understanding of motion under gravity.

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Homework Statement



Ok, well I have a Grade 11 Physics question regarding Projectile Motion Calculations. The question is: A bullet is shot horizontally from a gun. If the bullet's speed exiting the muzzle is 325 m/s and the height of the gun above the ground is 2.0m,

a) how long was the bullet in the air?


The Attempt at a Solution



I see that a) is looking for the time. As well as, I have 325 which I assume is the velocity and 2.0m which I assume is the distance. Now this is the part I am stuck on. Which formula do I use to find Time? Sorry if my question seems stupid. I'm just in need for some help.

Thanks
 
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Think about what the problem is asking you. Does the time it takes for the bullet to fall vertically depend on how fast it is moving horizontally?
 
fss said:
Think about what the problem is asking you. Does the time it takes for the bullet to fall vertically depend on how fast it is moving horizontally?

Hmm ... well I guess it would? Sorry I'm a physics noob.
 
nope it doesnt. it just depends on vertical direction...now do you get a clue?
 
It is basically a free fall problem.
 

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