A 45 kg ice dancer skates towards her non-moving partner (58 kg) at a velocity of 9 m/s to the right. How fast will they move (and in what direction) once her partner catches her?
a) 5.6 m/s to the right b) 6.7 m/s to the right c) 7.9 m/s to the right d) 9.2 m/s to the right
