Posted by tantan on Monday, May 28, 2012 at 6:47am.
Your "2.5 m/s" must be the acceleration, and should have been written 2.5 m/s^2.
The force acting is
F = m a = 60*2.5 = 150 N
The final speed is Vfinal = a*t
where t = 4.0 s. That would be 10 m/s
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