A 90 Kg Person Is Sitting in a 100 Kg

Multiple Choice

A 90 kg person is sitting in a 100 kg boat, which is floating at rest on a lake. In the boat is a stone with a mass of 5.0 kg. The person throws the stone at 4.0 m/s horizontally in the NORTH direction. The velocity of the person and the boat after throwing the stone is

A) 2.00 m/s NORTH.
B) 1.21 m/s SOUTH.
C) 1.21 m/s NORTH.
D) 0.11 m/s SOUTH.
E) 0.11 m/s NORTH.