Solving SAT Physics: Momentum of Block Starting from Rest at 5s

[spyroarcher]

Homework Statement

If the block starts from rest, its momentum at 5 seconds is...

Homework Equations

p=mv
F=ma
v=at

The Attempt at a Solution

When I thought about it, I was thinking about p=mv, and I had to substitute v to get a desirable answer. So I did p=m(at). However I only know the time, and I know the answer is 10 kg m/s, but I am not sure how to do it. Thanks in advance.

 

[Mindscrape]

"If the block starts from rest, its momentum at 5 seconds is..."

Is that the full question? If so, there is no answer.

 

[spyroarcher]

Yes that is the full question, if it is impossible, how would the book get 10?
It also said p=F(change in T) for the answer

 

[Mindscrape]

Sure, F=dp/dt, so ∆p=∫Fdt. If you have a constant force of 2N acting on the particle you will get ∆p=F∆t=2*5=10 kgm/s, but I don't see anything about that.