Which statement best describes why the universe could be considered an isolated system? (2 points) Select one: a. All matter that enters the universe remains contained within the universe. b. Energy and matter are created in the universe; when new energy is created, old energy exits. c. In the universe, all energy and matter are contained; no energy or matter enters or exits. d. The universe is a contained system where no energy exits.

Afaulty model rocket moves in the xy-plane (the positive y direction is vertically upward). the rocket's acceleration has components ax(t) = ? t2 and ay(t) = ? ? ? t, where ? = 2.50 m/s4 , ? = 9.00 m/s2 , and ? = 1.40 m/s3 . at t = 0 the rocket is at the origin and has velocity ~v0 = v0x ? i + v0y ? j with v0x = 1.00 m/s and v0y = 7.00 m/s. (a) calculate the velocity and position vectors as functions of time. (b) what is the maximum height reached by the rocket? (c) sketch the path of the rocket. (d) what is the horizontal displacement of the rocket when it returns to y = 0?