Calculating Distance from Constant Force: A Kinematics Problem

[magnifik]

Homework Statement

A dockworker applies a constant horizontal force of 72.0N to a block of ice on a smooth horizontal floor. The frictional force is negligible. The block starts from rest and moves a distance 10.0m in a time 4.50s. If the worker stops pushing at the end of 4.50 , how far does the block move in the next 5.70s?

Homework Equations

v = at
x = x0 + v0t + 1/2at^2

The Attempt at a Solution

I realized this is only a kinematics problem, but I keep getting the wrong answer. I got 32.1m, but the answer is 25.3m. I did v=at, plugging in 0.987654321*5.70 then multiplied this answer by 5.70. What am I doing wrong??

 

[ideasrule]

Nothing. Unless you made a mistake in typing the question out, your answer is correct.

 

[magnifik]

Weird. I copied & pasted the exact question from the website. Stupid MasteringPhysics -____-

 

[rl.bhat]

I did v=at, plugging in 0.987654321*5.70
You have to find the velocity at the end of 4.5s.

 

[ideasrule]

Oops, I somehow missed that too. Sorry magnifik!