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## Homework Statement

Evaluate the distance the cart travels from 18.0s to 21.0s.

The points are roughly (18.0, 22) and (21.0, 10). The slope/acceleration is constant.

## Homework Equations

Δx=(v

^{2}

_{f}−v

^{2}

_{i})/2a

Δx=0.5at

^{2}

Δx=0.5(base)(height)

## The Attempt at a Solution

I used the first equation as:

Δx=(v

^{2}

_{f}−v

^{2}

_{i})[itex]\overline{}2a[/itex]

=(22

^{2}−10

^{2})/2(-4) = -48 m

Δx=0.5at

^{2}= 0.5(-4)(9) = -18 m

Both of those were wrong along with the last equation (which also equaled -18 m). I really need help!