Projectile is fired over level ground

  • Thread starter Le_Anthony
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  • #1
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Homework Statement


A projectile is fired over level ground with an initial velocity that has a vertical component of 20 m/s and a horizontal component of 30 m/s. Using g = 10 m/s2, the distance from launching to landing points is:

Homework Equations


Vi(t) +0.5at^2

The Attempt at a Solution


I used the first equation to solve for the time it took from start to finish. 0=20m/s(t)+0.5(-10m/s2)t^2 and that gave me 4 seconds to launch and land.

Next i used the same equation only now i used the x component so x=30m/s(4s) and the displacement was 120 meters.

Any errors you see?
 

Answers and Replies

  • #2
61
22
I'm guessing you made a typo in your relevant equations...
 
  • #3
17
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I'm guessing you made a typo in your relevant equations...
What do you mean?
 
  • #4
SammyS
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Homework Statement


A projectile is fired over level ground with an initial velocity that has a vertical component of 20 m/s and a horizontal component of 30 m/s. Using g = 10 m/s2, the distance from launching to landing points is:

Homework Equations


Vi(t) +0.5at^2

The Attempt at a Solution


I used the first equation to solve for the time it took from start to finish. 0=20m/s(t)+0.5(-10m/s2)t^2 and that gave me 4 seconds to launch and land.

Next i used the same equation only now i used the x component so x=30m/s(4s) and the displacement was 120 meters.

Any errors you see?
Looks good to me !

I like the analysis.
 
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  • #5
17
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Looks good to me !

I like the analysis.
Thanks!
 

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