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May 19, 2013

# Homework Help: physics

Posted by tantan on Monday, May 28, 2012 at 6:47am.

a 60kg sprinter accelerates from rest at 2.5m/s east for 4s. what force is acting and what is his final speed?

• physics - drwls, Monday, May 28, 2012 at 7:17am

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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