# How Does Initial Velocity Affect Ball Speed at Landing?

• pack60
In summary, the conversation discusses questions related to projectile motion and vector mechanics. The main topics include the relationship between final velocity and acceleration, factors affecting the time in the air for a horizontally projected object, and the components of projectile affected by gravity. The conversation also mentions the importance of showing work and using equations when seeking help. Finally, the conversation ends with a question about vector components and an example problem involving an object being kicked at an angle.
pack60
can someone help me with some basic questions

Mind typing your question so that we can help??

questions I need help with

When final velocity is larger than initial velocity, then acceleration is what?

What affects the time that a horizontally projected object remains in the air?

What components of projectile are affected by gravity?

What are your thoughts on these questions? What equations are relevant? We can only help you if you show some of your own work on the problems.

1st question: I am thinking that acceleration is positive

2nd question: initial vertical velocity and relative projection height

3rd question: the vertical components, but not sure if their are specific vertical components

You got them right.

thanks I am new to this stuff and I am trying to figure it out. got time to help on more?

when it says the components of vector mechanics, are they just talking about the x and y components? Or the horizontal and vertical compponents?

The components are just the breakdown of the vector in whatever coordinate system you are using at the time. That could be left/right, forward/backward, up/down. Or (x,y,z). Or lots of other possibilities. (x,y,z) is just a little easier to work with compared to left/right, forward/backward, up/down.

thanks. next one
A ball is kicked with an initial velocity of 10 m/s at an angle of 30 degrees. Neglecting air resistance, what is the speed of the ball at landing?

Answer: 10 m/s, the ball will slow down on the way up and speed back up on the way down, maxing out at the initial velocity

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