A 2kg cart traveling at 6 m/s collides with a 2 kg cart at rest. What is the total final momentum of the system?

A) 0 kg m/s
B) 12 kg m/s
C) 3 kg m/s
D) 4 kg m/s
E) 2 kg m/s

Arocket starts from rest and moves upward from the surface of the earth. for the first 10.0 s of its motion, the vertical acceleration of the rocket is given by ay = 12.80 m/s32t, where the +y-direction is upward. (a) what is the height of the rocket above the surface of the earth at t = 10.0 s? b) what is the speed of the rocket when it is 325 m above the surface of the earth?