An object of mass M travels along a horizontal air track at a constant speed v and collides elastically with an object of identical mass that is initially at rest on the track. Which of the following statements is true for the two objects after the impact? a. The momentum of each object is ½ Mv
b. The total momentum is less than Mv and the total kinetic energy is ½ Mv2
c. The total momentum is Mv and the total kinetic energy is less than ½ Mv2
d. The kinetic energy of each object is ¼ Mv2
e. The total momentum is Mv and the total kinetic energy is ½ Mv2

Answertraveling around a circular trackexplanation"traveling around a circular track" is the best answer as you could be traveling around a circular track at a constant speed. your velocity would therefore have the same magnitude but will always be constantly direction. since acceleration is the rate of change of velocity, the rate of change will only involve the direction of velocity and not the magnitude.wrong choices: "an object at rest" does not accelerate at all"increasing speed while traveling around a curve" means that the acceleration will not be constant due to only change in direction; it will be constant due to both magnitude and direction"an object in free fall" does not necessarily change direction