Posted by **Anonymous** on Monday, June 17, 2013 at 8:05am.

solve physics question. a train moves 3.6km from rest to rest in 3minutes. the greatest speed is 90km/h, and the acceleration and retardation are uniform. find the distance travelled at full speed.

- Physics -
**Steve**, Monday, June 17, 2013 at 10:52am
It sounds like the acceleration and deceleration are equal in value. So, since

90km/hr = 25m/s

3 min = 180 sec

3.6km = 3600m

If acceleration/deceleration take t seconds, leaving u seconds for full-speed travel,

2t+u = 180

at = 25

at^2 + 25u = 3600

a = 25/3

t = 36

u = 108

so, going 25m/s for 108s = 2700m = 2.7 km

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