For one-dimensional motion, we align the x axis with the direction of the motion, and we are free to choose the origin at any place that’s convenient. If a particle is at at position x1 at some...For one-dimensional motion, we align the x axis with the direction of the motion, and we are free to choose the origin at any place that’s convenient. If a particle is at at position x1 at some time t1, then at position x2 at some later time t2, then the particle has undergone a displacement
where Δr=r2−r1 is the difference in the position vectors r1 and r2 at two closely spaced times t1 and t2, respe...where Δr=r2−r1 is the difference in the position vectors r1 and r2 at two closely spaced times t1 and t2, respectively. where Δv=v2−v1 is the difference in the velocity vectors v1 and v2 at two closely spaced times t1 and t2, respectively.