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The graph shows the position x as a function of time for the center of mass of a system of particles of total mass 6 kg. For a very short time interval around 2 s, an external force is exerted on an object in the system. What is the resulting change in momentum of the system? Two objects of mass 0.2 kg and 0.1 kg, respectively, move parallel to the x-axis, as shown below. The 0.2 kg object overtakes and collides with the 0.1 kg object. Immediately after the collision, the y-component of the velocity of the 0.2 kg object is 1 m/s upward. What is the y-component of the velocity of the 0.1 kg object immediately after the collision? A projectile of mass M1 is fired horizontally from a spring gun that is initially at rest on a frictionless surface. The combined mass of the gun and projectile is M2. If the kinetic energy of the projectile after firing is K, the gun will recoil with a kinetic energy equal to