Answer the multiple choice questions below.

1. A cart travels toward the right on a track where friction between the cart and track is negligible. The momentum of the cart as a function of time is modeled in the graph. Which of the following statements are true for the time recorded? Select two answers.

a) The change in momentum of the cart is nearly equal to 1.9 kg * m/s

b) The impulse delivered to the cart is nearly equal to 0.75 kg * m/s

c) The net external force exerted on the cart is nearly equal to 0.15N

d) The work done on the cart is nearly equal to 1.5 J

2.

Twc identical spaceships are moving through space both with speed tin. Ecth spaceships experience a net force of magnitude FD over the same time interval. Fcr spaceship 1, the net force acts in the same directicn as the spaceship is moving; for spaceship 2, the net force is directed opposite to the spaceship's motion, causing spaceship 2 to slow down but not step. For which spaceship, if either, does the kinetic energy change by a greater magnitude, and why? (A) Spaceship 1 will have a greater change in kinetic energy because the distance traveled is greater than that of spaceship 2. (B) Spaceship 2 will have a greater change in kinetic energy because the force slows down the spaceship. (C) Spaceship 1 and 2 have the same change in kinetic energy because the time and the force are the same. Spaceship 1 and 2 have the same change in kinetic energy because the net work dcne on each has the same {D} magnitude. A cart of mass in rolls past the circular bottom of a hill (point P). Which of the following statements about the normal force F. exerted on the cart at point P.is correct? A Fa - my, because the normal force on an incline is equal to my cos f and 9 - 0 at point P. For my because the speed of the cart is neither increasing nor decreasing at point P F. is equal to the centripetal force on the cart at point P, because only the track can exert a force toward the center of the circle. Fo is greater than my at point P. because the cart is experiencing an upward acceleration