Tuesday
July 28, 2015

Homework Help: physics

Posted by laura on Thursday, August 18, 2011 at 2:16am.

A passenger train is traveling at 30 m/s when the engineer sees a freight train 357 m ahead of his train traveling in the same direction on the same track. The freight train is moving at a speed of 5.9 m/s.
(a) If the reaction time of the engineer is 0.43 s, what is the minimum (constant) rate at which the passenger train must lose speed if a collision is to be avoided?
m/s2

(b) If the engineer's reaction time is 0.87 s and the train loses speed at the minimum rate described in Part (a), at what rate is the passenger train approaching the freight train when the two collide?
m/s

(c) For both reaction times, how far will the passenger train have traveled in the time between the sighting of the freight train and the collision?
km

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