Projectile Motion: Solving for Velocity Components | Tower Launch

[jklops686]

Homework Statement

A Projectile is launched from the top of a 100m tower and falls 20m below the bottom of the tower and 90m away in the x direction. Time of flight is 6 seconds.

1. Find the x component of the velocity of the object when it strikes the ground.


2. Find the y-component of the inital velocity of the object.

Homework Equations

I tried using Δx=Vi,x(t) to solve for the x component of Vf (since the inital should be the same as the final). Then I did the same thing for the y component of Vi.

The Attempt at a Solution

I got 15m/s for the x component of Vf and I'm not sure if this is correct. For the y component of Vi I solved and got 20m/s. I used -120m for Δy and I'm not sure if this is right because in the picture it shows the projectile going up a little before it begins to go down 120m.

Any input would be greatly appreciated

 

[Toranc3]

Yo I got 15m/s for x. My y was wrong sorry.

 

[tms]

Don't forget that the y component of velocity is affected by gravity.

 

[Toranc3]

Homework Statement

A Projectile is launched from the top of a 100m tower and falls 20m below the bottom of the tower and 90m away in the x direction. Time of flight is 6 seconds.

1. Find the x component of the velocity of the object when it strikes the ground.


2. Find the y-component of the inital velocity of the object.

Homework Equations

I tried using Δx=Vi,x(t) to solve for the x component of Vf (since the inital should be the same as the final). Then I did the same thing for the y component of Vi.

The Attempt at a Solution

I got 15m/s for the x component of Vf and I'm not sure if this is correct. For the y component of Vi I solved and got 20m/s. I used -120m for Δy and I'm not sure if this is right because in the picture it shows the projectile going up a little before it begins to go down 120m.

Any input would be greatly appreciated

What did you end up getting for the y?

 

[ehild]

Homework Statement

A Projectile is launched from the top of a 100m tower and falls 20m below the bottom of the tower and 90m away in the x direction. Time of flight is 6 seconds.

1. Find the x component of the velocity of the object when it strikes the ground.


2. Find the y-component of the inital velocity of the object.

Homework Equations

I tried using Δx=Vi,x(t) to solve for the x component of Vf (since the inital should be the same as the final). Then I did the same thing for the y component of Vi.

The Attempt at a Solution

I got 15m/s for the x component of Vf and I'm not sure if this is correct. For the y component of Vi I solved and got 20m/s. I used -120m for Δy and I'm not sure if this is right because in the picture it shows the projectile going up a little before it begins to go down 120m.

Any input would be greatly appreciated

How is the displacement along y related to the time of flight?

ehild

 

[Toranc3]

Yo i got this problem too. Is vy 9.43m/s?

 

[ehild]

Yo i got this problem too. Is vy 9.43m/s?

Excellent!

ehild

 

[Toranc3]

Excellent!

ehild

Awesome thanks!

 

[jklops686]

I got it. Wow, I don't know how I missed that. Maybe my brain was overloaded from studying all day and just farted. Thanks, though!