# Displacement question

Hi there, I'm having a problem with this question, it seems like I'm doing everything perfect but still getting the wrong answer:

## Homework Statement

During a 29.4-s interval, the velocity of a rocket changes from 204m/s [fwd] to 508m/s [fwd]. Assuming constant acceleration, determine the displacement of the rocket during this time interval.

d=1/2(v1+v2)t

## The Attempt at a Solution

t=29.4s
v2=508m/s [fwd]
v1=204m/s [fwd]
d=?

d=1/2(204+508)x29.4
=4,468.8m

This answer is wrong, the correct answer (based on the book) is 10500m [fwd]

THANKS!