Homework Help: Physics

Posted by Casey on Thursday, October 28, 2010 at 8:11pm.

A motor cyclist traveling at 30 m/s accelerates uniformly for 5 seconds to v= 40 m/s. H then maintains a constant velocity for the next 4 minutes. How far did the motor cyclist travel throughout the entire motion?

Physics - Henry, Friday, October 29, 2010 at 10:52pm
a = (Vf - Vo) / t,
= (40 - 30) / 5 = 2 m/s^2.

4 min * 60 s/min = 240 s.
d = Vo*t + 0.5*at^2,
= 30*240 + 0.5 * 2 * (240)^2,
= 7200 + 57600 = 64800 m = 64.8km.
Physics - Henry, Saturday, October 30, 2010 at 4:19pm
A more practical approach
4 min. = 240 s.
d=V*t=40 m/s * 240 s = 9600 m = 9.6km.

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