1) Betty has a mass of 60 kg and is standing at rest on a raft of 20 kg moving at 5.0 m/s [E]. She starts walking East at 2.0 m/s relative to the raft. Determine the new velocity of the raft relative to the river bank

2)Moose the astronaut with a backpack have a mass 150 kg. He is on a spacewalk and is stranded 10 m away from the space station hatch. He removes and throws his 25 kg pack away from the space station with 500 N of force for 0.50 s. How long will it take Moose to reach the hatch?