Posted by **Nicole** on Friday, October 15, 2010 at 7:13pm.

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?

- Help me please with physics -
**bobpursley**, Friday, October 15, 2010 at 7:14pm
force pulled-friction= ma

start with that, solve for a.

- Help me please with physics -
**Nicole**, Friday, October 15, 2010 at 7:20pm
Fnet=65-15=0?

50 is the answer?

- Help me please with physics -
**Nicole**, Friday, October 15, 2010 at 7:54pm
I got finally got letter a but im stuck at b now :(

- Help me please with physics -
**bobpursley**, Friday, October 15, 2010 at 8:43pm
if you have a...

Vf^2=Vi^2+2ad

Vi is zero, you know a, and d. solve for Vf

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