(Solved): 4. We set the origin of a coordinate system so that the position of a train is \( x=0 \mathrm{~m} \ ...

4. We set the origin of a coordinate system so that the position of a train is \( x=0 \mathrm{~m} \) at \( \mathrm{t}= \) \( 0 \mathrm{~s} \). Figure shows the train's velocity graph. a. Draw position vs time graph for the train. b. Draw acceleration vs time graph for the train. c. What is the acceleration of the train at \( \mathrm{t}=1 \mathrm{~s}, \mathrm{t}=3 \mathrm{~s}, \mathrm{t}=5 \mathrm{~s} \) and at \( \mathrm{t}=9 \mathrm{~s} \).