Sally and Jeff are ice skating. They are both skating in the same direction, due north. Sally is behind Jeff and is skating quickly with a velocity of 7.00 m/s to catch up with him. When she catches up with Jeff, she grabs on to him and they both continue skating together in the same direction as before with a velocity of 5.00 m/s. Sally weighs 60 kg and Jeff weighs 70 kg. You can ignore the effect of friction.

What was Jeff's initial velocity in m/s?

What is the magnitude of the impulse that Jeff experienced in the collision in m/s?

Sally and Jeff continue skating together due north. Terry is traveling due east with a velocity of 5 m/s toward Sally and Jeff. Terry briefly collides with Sally and Jeff and then pushes off. After the collision, Terry is traveling 5 m/s due west. Terry weighs 64 kg.

If the collision lasted 1/2 of a second and the force that Terry exerted on Sally and Jeff was constant, what was the magnitude of the force that Terry exerted in Newtons?

If the skaters traveled 2 m eastward during the collision, what was the work that Terry did during the collision in Joules?

What is the magnitude of the Jeff's final velocity? Hint: Look at the changes in momentum, and remember to keep track of their directions.