The
v-t
graph for a train has been experimentally determined. From the data, construct the (a) a-t graph and (b) s-t graph for the motion for
0<=t<=180s
. *(c) Write the equation of
s-t
graph when
120s<=t<=180s
. Note: when
t=0,s=0
. Make sure to answer every single part, especially part c!