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I tried to re-solve the questions by myself but there is one question made me confused as I get a result mentioned in the options but the marked answer is different.

I am talking about question 3 in the following picture

## Homework Statement

Vo= 0 m/s

V= 20 m/s

Xo= 0 m

X= 800 m

t= 25 s

a= ?

## Homework Equations

1) X = Xo + Vo t + 0.5 a t^2

2) V^2 = Vo^2 + 2 a (X-Xo)

## The Attempt at a Solution

I used the first equation

X = Xo + Vo t + 0.5 a t^2

solution will be

800 = 0 + 0 (25) + 0.5 a (25)^2

800 = a 312.5

-a 312.5 = 800

-a = 800/312.5 = 2.56

then I took the square root of 2.56 and I got 1.6 m/s^2

So -a = -1.6 m/s^2

Is that right or no?