Help me please with physics
posted by Nicole .
A 25kg mass is on a level, rough surface where the force of friction is a constant 15 N. A horizontal applied force of 65 N acts on the mass. The mass is initially at rest.
a) what speed does the mass have after 4.0 seconds?
b) what speed does the mass have after being moved 2.0m?

force pulledfriction= ma
start with that, solve for a. 
Fnet=6515=0?
50 is the answer? 
I got finally got letter a but im stuck at b now :(

if you have a...
Vf^2=Vi^2+2ad
Vi is zero, you know a, and d. solve for Vf