Two People Sit Face to Face on Nice Skateboards That

Multiple Choice

Two people sit face to face on nice skateboards that are free to roll without friction. They push each other with a force of 40 N and move apart. Person X, whose mass (including the skateboard) is 50 kg, moves to the left at 3 m/s. Person Z, whose mass (including the skateboard) is 60 kg,

A) moves to the right at 2.5 m/s.
B) moves to the right at 1 m/s.
C) moves to the right at 4 m/s.
D) moves to the right at 10 m/s.