Iron Man is riding a frictionless skateboard travelling in a straight line on horizontal flat ground. At t=0, Iron Man is moving to the left at 40 m/s. After travelling at constant velocity of 1 s, he fires his blasters to accelerate towards the right at −10 m/s2 for the next 6 s. He then maintains speed for 2.5 s before accelerating at 4 m/s2 to come to a stop at the location where he started and stay there for the rest of the time. Draw the v vs. t graph and x vs. t graph in the grids below. Set x to be 0 at t=0.