- #1

CollegeStudent

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## Homework Statement

A ball is thrown straight up at 30m/s. Assume g is 10m/s/s Show the dispacement, velocity, and acceleration at each position.

## Homework Equations

Vf² = Vi² + 2aΔx

Vf = Vi + at

## The Attempt at a Solution

So first I wanted to solve for the time it takes to go up so

Vf = Vi + at

0 = 30 + (-10)t

t = -30/-10 = 3 seconds up

then just times 2 because its the same coming down

so 6 seconds in all

Now for distance up

Vf² = Vi² + 2aΔx

Δx = (Vf² - Vi²)/2a

Δx = (0 - 900)/2(-10)

Δx = (-900)/(-20)

Δx = 45m up

and again times 2

so 90 meters in all

Now for some reason I'm having trouble figuring out how to find the velocity,displacement,and acceleration at each 1 second interval.

Should acceleration stay the same until the top where its 0 then change to +10m/s/s?

And how and what formula would I use for the other two?

Thanks in advance everyone