The figure shоws а pоsitiоn-time grаph of аn object moving along x-axis. t2=[t2] s, t3=[t3] s, x1=[x1] m, x2=[x2] m, x3=[x3] m. What is the velocity of the object from time 0 to t2? Express your answer in m/s. Note that velocity can be negative or positive.