Posted by Danny on Friday, June 7, 2013 at 10:57pm.
1. A train traveling at a speed of 110km/h decelerates for 20 seconds. During that time it travels 450 meters.
A) What is the acceleration? = m/s^2
B) What is its speed after deceleration? = km/h
Initial velocity (u) = 110km/h
Time (t) = 20s
Distance = 450m
Using this formula s = ut + 1/2 at^2
I need some help. Thank you.

Physics  Elena, Saturday, June 8, 2013 at 6:55am
v₀=110 km/h=30.6 m/s
s=v₀tat²/2,
a=2(v₀ts)/t²=…
v= v₀at=…

Physics  Anonymous, Tuesday, September 16, 2014 at 3:09pm
5. An observer measured an interval of 10s between seeing a lightning flash and hearing the thunder. If the temperature of the air was 20 degrees Celsius, how far away was the source of sound?
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