An electric train moves from
rest with a uniform
acceleration of 1.5m/s square
for the first ten seconds and
continue to accelerate at 0.5
m/s square for a further 20s,it
continue at constant speed for
90s and finally take 30s to
decellerate uniforming to rest.
(a) draw a graph of speed against time for
the journey (b) from your graph or
otherwise deduce the total distance
travelled (c) what is the average speed of
the whole journey