Uniform circular motion mass problem

[softball1394]

Homework Statement

A mass of 1.5 kg moves in a circle of radius 25 cm at 2 rev/s. calculate (a) the tangential velocity, (b) the acceleration, (c) the required centripetal force for the motion.
Answers:
A) 3.14 m/s
B) 39.4 m/s^2 radially inward
C) 59 N

Homework Equations

v=2piR/T

The Attempt at a Solution

(for part a)
V = 2 pi 25 / T
but what is T?

then i tried:
F = ma = mv^2/r
v^2=Fm/r
v= (the square root of)Fm/r
but I don't know what F is.

 

[softball1394]

I think I've got it!

V= 2 pi r / t
V= 2 pi .25 / .5
V=1.57/.5
V=3.14 m/s

r = .25, not 25, because it has to be in meters.
and t = .5 because if it takes 1 second to make 2 revolutions, it must take .5 seconds to make one revolution.

yay (: