Angles of projectiles

[nubs]

umm, should still be 49
don't think you can get an obtuse angle for collision with ground if your velocity vector is positive for i, j

I thought it was obtuse if it was positive of i, and acute if it was negative for i :/

[illuminati]

displacement vector's j component isn't 0 meaning the object isn't hitting the ground
it is ~83.30 units above the ground

assuming that j is the vertical component and j component = 0 is the ground

hits ground when 5t^2 = 0 --> t=0 only

yeah, j component isn't the height...
its the k component

[illuminati]

umm, should still be 49
don't think you can get an obtuse angle for collision with ground if your velocity vector is positive for i, j

I thought it was obtuse if it was positive of i, and acute if it was negative for i :/

tan inverse has a range of -pi/2 to pi/2, so thats why i assume angle of collisions would never be above 90 degrees....

[RobM8]

So far, I have only ever come across questions where j is the vertical component, i is the horizontal component and k is the forwards and backwards component.

[david10d]

So far, I have only ever come across questions where j is the vertical component, i is the horizontal component and k is the forwards and backwards component.

sorry for the bump


i've seen where K is the vertical component.


which is correct?

[HarveyD]

it doesnt matter, they will tell you