Chapter 9, Problem 115P

SSM At time t = 0, force ${\stackrel{\to }{F}}_1=(-4.00\hat{i}\text{ + 5}\text{.00}\hat{j}\text{)}$ N acts on an initially stationary particle of mass 2.00 × 10⁻³ kg and force ${\stackrel{\to }{F}}_2=(2.00\hat{i} -\text{ 4}\text{.00}\hat{j}\text{)}$ N acts on an initially stationary particle of mass 4.00 × 10⁻³ kg. From time t = 0 to t = 2.00 ms, what are the (a) magnitude and (b) angle (relative to the positive direction of the x axis) of the displacement of the center of mass of the two-particle system? (c) What is the kinetic energy of the center of mass at t = 2.00 ms?